Amc 10a 2023 - Problem 1. Mrs. Jones is pouring orange juice into four identical glasses for her four sons. She fills the first three glasses completely but runs out of juice when the fourth glass is only full. What fraction of a glass must Mrs. Jones pour from each of the first three glasses into the fourth glass so that all four glasses will have the same amount of juice?

 
Solution 1. Due to rotations preserving an equal distance, we can bash the answer with the distance formula. , and . Thus we will square our equations to yield: , and . Canceling from the second equation makes it clear that equals . Substituting will yield. Now .. Abtco vinyl siding

The following problem is from both the 2023 AMC 10A #16 and 2023 AMC 12A #13, so both problems redirect to this page. Contents. 1 Problem; 2 Solution 1; 3 Solution 2; 4 Solution 3; 5 Solution 4; 6 Solution 5 (🧀Cheese🧀) 7 Video Solution by Power Solve (easy to understand!)Learn how to approach the 2023 AMC 10A exam, a math competition for high school students, with tips on module-specific breakdown, question types, and error-prone and tricky questions. Find out the overall difficulty levels, key knowledge areas, and strategies for each question in algebra, geometry, combinatorics, and number theory.Score Distribution. School Year: 2023/2024 2022/2023. Competition: AIME I - 2024 AIME II - 2024 AMC 10 A - Fall 2023 AMC 10 B - Fall 2023 AMC 12 A - Fall 2023 AMC 12 B - Fall 2023 AMC 8 - 2024. View as PDF.Solution 1. Let's use the triangle inequality. We know that for a triangle, the sum of the 2 shorter sides must always be longer than the longest side. This is because if the longest side were to be as long as the sum of the other sides, or longer, we would only have a line. Similarly, for a convex quadrilateral, the sum of the shortest 3 sides ...AMC 10A. The 2024 AMC 10A has not yet happened; do not believe any statistics you see here. Average Score: AIME Floor: Distinction: Distinguished Honor Roll: AMC 10B. The 2024 AMC 10B has not yet happened; do not believe any statistics you see here. Average Score: AIME Floor: Distinction: Distinguished Honor Roll: AMC 12A2023 AMC 10A Problems/Problem 25 - AoPS Wiki. Art of Problem Solving. AoPS Online. Math texts, online classes, and more. for students in grades 5-12. Visit AoPS Online ‚. Books for Grades 5-12 Online Courses. Beast Academy. Engaging math books and online learning.November 2023) This article relies excessively on references to primary sources. Please improve this article by adding ... Problem 18 on the 2022 AMC 10A was the same as problem 18 on the 2022 AMC 12A. Since 2002, two administrations have been scheduled, ...Solution 1 (Three Right Triangles) Drawing the tetrahedron out and testing side lengths, we realize that the and are right triangles by the Converse of the Pythagorean Theorem. It is now easy to calculate the volume of the tetrahedron using the formula for the volume of a pyramid. If we take as the base, then must be the altitude.2022 AMC 10A The problems in the AMC-Series Contests are copyrighted by American Mathematics Competitions at Mathematical Association of America (www.maa.org). For more practice and resources, visit ziml.areteem.org. Q u e s t i o n . 1. N o t ye t a n sw e r e d. M a r ke d o u t o f 6.The 2023 AMC 10A/12A will be held on Wednesday, November 8, 2023. We posted the 2023 AMC 10A Problems and Answers, and 2023 AMC 12A Problems and Answers at 8:00 a.m. (EST) on November 9, 2023. Your attention would be very much appreciated.Score Distribution. School Year: 2023/2024 2022/2023. Competition: AIME I - 2024 AIME II - 2024 AMC 10 A - Fall 2023 AMC 10 B - Fall 2023 AMC 12 A - Fall 2023 AMC 12 B - Fall 2023 AMC 8 - 2024. View as PDF.The 2023 AMC 10A/12A will be held on Wednesday, November 8, 2023. We posted the 2023 AMC 10A Problems and Answers, and 2023 AMC 12A Problems and Answers at 8:00 a.m. (EST) on November 9, 2023. Your attention would be very much appreciated.Solution Video to the following problems from the American Mathematics Competitions:2023 AMC 10A #243 Nov 2023 ... AoPS publishes practice contests each year for the AMC8/10/12, which can be found at https://artofproblemsolving.com/contests/practice.Nov 9, 2023 · By now, many students and parents in the math competition community are aware of leaks of problems for the AMC 10A and 12A math contests that were held on Wednesday, November 8th, 2023. Reports of the leak surfaced the weekend before the exam with a change.org petition being started on November 4th asking the MAA to take action to preserve Solution 1 (Inequality) The volume of the cube is and the volume of a clay ball is. Since the balls can be reshaped but not compressed, the maximum number of balls that can completely fit inside a cube is Approximating with we have or We simplify to get from which. ~NH14 ~MRENTHUSIASM. Solution 3 (Intuitive) From to degrees Fahrenheit, the Breadus scale goes from to . to degrees is a span of , and we can use this to determine how many Fahrenheit each Breadus unit is worth. divided by is , so each Breadus unit is Fahrenheit, starting at Fahrenheit. For example, degree on the Breadus scale is , or Fahrenheit. Exactly the week before exam of AMC 10A and 12A 2023 I released 4 preparation videos(links below) that had useful ideas for AMC 10 12 and other exams and I s... The test was held on Wednesday, November 8, 2023. 2023 AMC 10A Problems. 2023 AMC 10A Answer Key. Problem 1. Problem 2. Problem 3. Problem 4.The rest contain each individual problem and its solution. 2003 AMC 10A Problems. Answer Key. 2003 AMC 10A Problems/Problem 1. 2003 AMC 10A Problems/Problem 2. 2003 AMC 10A Problems/Problem 3. 2003 AMC 10A Problems/Problem 4. 2003 AMC 10A Problems/Problem 5. 2003 AMC 10A Problems/Problem 6.Registration for the AIME is automatic. Any students taking the AMC 12 and scoring in the top 5% or over 100, or are in the top 2.5% of the scores on the AMC 10 qualify. The testing materials (including the tests, answer sheets, teachers manual, and computer identification form) are included with the results packet from the AMC 10 and/or the ...American Invitational Mathematics Exam (II) – 16/17th Feb 2023 (Invited candidates only.TBA) **Candidates can register for more than 1 competition as long as the contest does not fall on the same day. Hence candidates CANNOT register for both AMC 10A and 12A but they can register for AMC 10A and 12B. Solution 3. Let be the amount of games the right-handed won. Since the left-handed won games, the total number of games played can be expressed as , or , meaning that the answer is divisible by 12. This brings us down to two answer choices, and . We note that the answer is some number choose . This means the answer is in the form . 2023 AMC 10A, 12A, 10B, 12B problems with solutionsSolution 1 (Inequality) The volume of the cube is and the volume of a clay ball is. Since the balls can be reshaped but not compressed, the maximum number of balls that can completely fit inside a cube is Approximating with we have or We simplify to get from which. ~NH14 ~MRENTHUSIASM.Part joke, part-get-rich-quick scheme, here's how meme stocks like AMC and GameStop defy financial gravity. By clicking "TRY IT", I agree to receive newsletters and promotions from...2023 AMC 10A & AMC 12A Answer Key Released. Posted by John Lensmire. Yesterday, thousands of middle school and high school students participated in this year’s AMC 10A and 12A Competition. The problems can now be discussed! See below for answer keys and concepts tested for every problem on the 2023 AMC 10A and AMC 12A held on November 8th, 2023.Solution 1. Let be a point in polar coordinates, where is in degrees. Rotating by counterclockwise around the origin gives the transformation Reflecting across the -axis gives the transformation Note that We start with in polar coordinates. For the sequence of transformations it follows that.For this reason, we provided all 35 sets of previous official AMC 10 contests (2000-2017) with answer keys and also developed 20 sets of AMC 10 mock test with detailed solutions to help you prepare for this premier contest. 20 Sets of AMC 10 Mock Test with Detailed Solutions. 2017 AMC 10A Problems and Answers.11.8.2023 AMC 10A/11.14.2023 AMC 10B. What is the AMC 10? The AMC 10 is a 25-question, 75-minute, multiple-choice examination in high school mathematics designed to promote the development and enhancement of problem-solving skills. The AMC 10 is for students in 10th grade and below and covers the high school curriculum up to 10th grade.AMC 10A Problems (2012) AMC 10A Solutions (2012) AMC 10B Problems (2012) AMC 10B Solutions (2012) AMC 10 Problems (2000-2011) 4.3 MB: AMC 10 Solutions (2000-2011) 4.7 MB: The primary recommendations for study for the AMC 10 are past AMC 10 contests and the Art of Problem Solving Series Books.Solution 3. Consider sequences of 4 integers with each integer between 1 and 6, the number of permutations of 6 numbers is . The following 4 types of sequences that might generate a running total of the numbers to be equal to 3 (x, y, or z denotes any integer between 1 and 6). Sequence #1, (1, 1, 1, x): there are possible sequences.AMC and GME stock have been two of the most popular meme stocks of 2021. But one of them is the better long-term investment. AMC and GameStop are the most popular meme investments ...The AMC 10/12 is usually administered in the second and third weeks of November. There is a 1-day window for students to take the test. In Fall 2023, the tests will be administered on Wednesday, November 08, and Tuesday, November 14. Both tests are administered at Random Math. Random Math will administer the 2023 AMC 10/12 math competitions in ... 2022 AMC 10A Printable versions: Wiki • AoPS Resources • PDF: Instructions. This is a 25-question, multiple choice test. Each question is followed by answers ... Math-Olympiad-Date- Deadline-RegistrationExactly the day before exam of AMC 10A and 12A I released a preparation video(link below) that had useful ideas for ...11 Nov 2022 ... 2023 AMC 10 A Problem 24, Hexagonal Madness simplified ... 2022 AMC 10A. TheBeautyofMath · Playlist · 13 ... Live Solve of the 2023 AMC 12B unseen, ...Problem 1. What is the value of ?. Solution. Problem 2. Menkara has a index card. If she shortens the length of one side of this card by inch, the card would have area square inches. What would the area of the card be in square inches if instead she shortens the length of the other side by inch?. SolutionUnfortunately however, the current MAA administration is not very competent and has screwed up a ton (e.g. messing up the USAMO qualifier list in 2022, resulting in an extra hundred people qualifying), and their general response seems to be just to do nothing. So that is what most likely will happen. 1. [deleted]2020 AMC 10A problems and solutions. This test was held on January 30, 2020. 2020 AMC 10A Problems. 2020 AMC 10A Answer Key. Problem 1. Problem 2. Problem 3. Problem 4. Problem 5.As of 2015, Charter Spectrum offers more than 200 channels, including Disney Channel, CNN, Syfy and ABC. Other available channels include Bravo, USA Network, Oxygen and E! Charter ...The following problem is from both the 2023 AMC 10A #1 and 2023 AMC 12A #1, so both problems redirect to this page. Contents. 1 Problem 1; 2 Solution 1; 3 Solution 2; 4 Solution 3; 5 Solution 4; 6 Solution 5 (Under 20 seconds) 7 Solution 6 (simple linear equations) 8 Solution 7. 8.1 Video Solution 1 (⚡Under 1 min⚡)Solution 1 (Manipulation) Let be the length of the shorter leg and be the longer leg. By the Pythagorean theorem, we can derive that . Using area we can also derive that . as given in the diagram, we can find that because . This means that and . Adding the equations gives and when is plugged in . Rationalizing the denominators gives us .*IF you understand the material learned in the reference problem. Explanation of how takes longer of course, but the solve process live does not.This problem...2023-24 AMC series registration: AMC 8, AMC 10A, AMC 12A - Cognito FormsProblem. The sum of three numbers is The first number is times the third number, and the third number is less than the second number. What is the absolute value of the difference between the first and second numbers? Solution 1. Let be the third number. It follows that the first number is and the second number is . We have from which . Therefore, the first …Unfortunately however, the current MAA administration is not very competent and has screwed up a ton (e.g. messing up the USAMO qualifier list in 2022, resulting in an extra hundred people qualifying), and their general response seems to be just to do nothing. So that is what most likely will happen. 1. [deleted]Mastering AMC 10/12 book: https://www.omegalearn.org/mastering-amc1012. The book includes video lectures for every topic on the AMC 10/12 contests, along wit...Both of these tests can be found here. I didn't do great on AMC 10A. I got stuck on problem #10 and spent way too long trying to solve it, eventually skipping ...Dec 15, 2022 · In 2016, we had 36 students who are qualified to take AIME either through AMC 10A/12A or AMC 10B/12B. One of our students was among the 23 Perfect Scorers worldwide on the AMC 10A: Joel (Junyao) T. Particularly, seven middle schoolers and one elementary schooler qualified for the AIME, which is geared toward high school students. Exactly the week before exam of AMC 10A and 12A 2023 I released 4 preparation videos(links below) that had useful ideas for AMC 10 12 and other exams and I s...One of our students was among the 6 Perfect Scorers worldwide on the AMC 10A: Justin W. and one of our students was among the 3 Perfect Scorers worldwide on the AMC 12B: Ming Y. Read more at: 96 Students Qualified for the 2023 AIME and 2 Students Received Perfect Scores on the 2023 Fall AMC 10/12Solution 1. Note Euler's formula where . There are faces and the number of edges is because there are 12 faces each with four edges and each edge is shared by two faces. Now we know that there are vertices on the figure. Now note that the sum of the degrees of all the points is twice the number of edges. Let the amount of vertices with edges.AMC 10/12 2023-2024 Registration. AIME 2024 Problems and Solutions are available on our AIME page. ... Wednesday, November 08 Session 1: 4:30-6:00 pm - REGISTRATION CLOSED FOR AMC 10A AMC 12B: Tuesday, November 14, Session 1: 4:30-6:00 pm - REGISTRATION CLOSED FOR AMC 10B. Where: In-person at the Cupertino center … Exactly the week before exam of AMC 10A and 12A 2023 I released 4 preparation videos(links below) that had useful ideas for AMC 10 12 and other exams and I s... 11 Nov 2022 ... AMC 10A 2023 2024 Full Solutions Problems American Mathematics Competitions B Olympiad Tutor Course. Math Gold Medalist•3.1K views · 18:28 · Go ....Mastering AMC 10/12 book: https://www.omegalearn.org/mastering-amc1012. The book includes video lectures for every topic on the AMC 10/12 contests, along wit...2023 AMC 10A problems and solutions. The test was held on Wednesday, November 8, 2023. 2023 AMC 10A Problems. 2023 AMC 10A Answer Key. Problem 1.2022 AMC 10A The problems in the AMC-Series Contests are copyrighted by American Mathematics Competitions at Mathematical Association of America (www.maa.org). For more practice and resources, visit ziml.areteem.org. Q u e s t i o n . 1. N o t ye t a n sw e r e d. M a r ke d o u t o f 6.Score Distribution. School Year: 2023/2024 2022/2023. Competition: AIME I - 2024 AIME II - 2024 AMC 10 A - Fall 2023 AMC 10 B - Fall 2023 AMC 12 A - Fall 2023 AMC 12 B - Fall 2023 AMC 8 - 2024. View as PDF.Solution 2 (Casework) Case 1: All the rectangles are different colors. It would be choices. Case 2: Two rectangles that are the same color. Grouping these two rectangles as one gives us . But, you need to multiply this number by three because the same-colored rectangles can be chosen at the top left and bottom right, the top right and bottom ...2022 AMC 10A Printable versions: Wiki • AoPS Resources • PDF: Instructions. This is a 25-question, multiple choice test. Each question is followed by answers ...5 Sept 2023 ... Students scoring in the top 1% nationally (or score at least 120) on the AMC 10 also qualify for the AIME. Practice Exams: AMC 10A 2008 AMC 10A ...AIME Cutoffs and AMC 10/12 Awards. Posted by Areteem. The 2023-24 AIME will be held on February 1st, 2024 (AIME I) and February 7th, 2024 (alternate date for AIME II). Qualifying scores from the Fall 2023 AMC 10 and 12 exams are shown below. Contest. AIME Cutoff. Honor Roll of Distinction. Distinction. AMC 10A.Problem. Emily sees a ship traveling at a constant speed along a straight section of a river. She walks parallel to the riverbank at a uniform rate faster than the ship. She counts equal steps walking from the back of the ship to the front. Walking in the opposite direction, she counts steps of the same size from the front of the ship to the back.Score Distribution. School Year: 2023/2024 2022/2023. Competition: AIME I - 2024 AIME II - 2024 AMC 10 A - Fall 2023 AMC 10 B - Fall 2023 AMC 12 A - Fall 2023 AMC 12 B - Fall 2023 AMC 8 - 2024. View as PDF.Small live classes for advanced math and language arts learners in grades 2-12.Mastering AMC 10/12 book: https://www.omegalearn.org/mastering-amc1012. The book includes video lectures for every topic on the AMC 10/12 contests, along wit...Solution 3 (Circumradius's Formula) We can guess that this quadrilateral is actually made of two right triangles: has a ratio in the side lengths, and is a triangle. (See Solution 1 for a proof.) Next, we can choose one of these triangles and use the circumradius formula to find the radius. Let's choose the triangle.Solution 2 (Casework) Case 1: All the rectangles are different colors. It would be choices. Case 2: Two rectangles that are the same color. Grouping these two rectangles as one gives us . But, you need to multiply this number by three because the same-colored rectangles can be chosen at the top left and bottom right, the top right and bottom ... 2023 AMC 10A Printable versions: Wiki • AoPS Resources • PDF: Instructions. This is a 25-question, multiple choice test. Each question is followed by answers ... Are you a fan of captivating storytelling, gripping dramas, and thrilling movies? Look no further than the AMC Plus Channel. With an impressive lineup of shows and movies, this str...2023 AMC 10B. 2023 AMC 10B problems and solutions. The test was held on November 14, 2023. 2023 AMC 10B Problems. 2023 AMC 10B Answer Key. Problem 1. Problem 2. Problem 3. Problem 4.Solution 7. First, we find . We know that it is greater than , so we first input . From the first equation, , we know that if is correct, after we add to it, it should be divisible by , but not : This does not work. To get to the nearest number divisible …Mastering AMC 10/12 book: https://www.omegalearn.org/mastering-amc1012. The book includes video lectures for every topic on the AMC 10/12 contests, along wit...Solution 2. Since it can be a bit odd to think of "liters per km", this statement's numerical value is equivalent to km per liter: km requires liters, so the numerator is simply . Since liters is gallon, and miles is gallon, we have . Therefore, the requested expression is …Solution Video to the following problems from the American Mathematics Competitions:2023 AMC 10A #18Exactly the day before exam of AMC 10A and 12A I released a preparation video(link below) that had useful ideas for AMC 10 12 and other exams and I solved ma...15 Feb 2021 ... Math #Mathematics #MathContests #AMC8 #AMC10 #AMC12 #Gauss #Pascal #Cayley #Fermat #Euclid #MathLeague CanadaMath is an online collection of ...EVA, AMC, AMC@KH570, and HPCTP were dried at 50 °C for 10 hours before processing. The components were blended in a torque rheometer (Rheocord …**Candidates can register for more than 1 competition as long as the contest does not fall on the same day. Hence candidates CANNOT register for both AMC 10A ...2023 AMC 10A Problems/Problem 25 - AoPS Wiki. Art of Problem Solving. AoPS Online. Math texts, online classes, and more. for students in grades 5-12. Visit AoPS Online ‚. Books for Grades 5-12 Online Courses. Beast Academy. Engaging math books and online learning.AMC Historical Statistics. Please use the drop down menu below to find the public statistical data available from the AMC Contests. Note: We are in the process of changing systems and only recent years are available on this page at this time. Additional archived statistics will be added later. .Don't miss the chance to see The Boys in the Boat, a documentary film that follows the remarkable journey of the University of Washington rowing team that defied the Nazis …Score Distribution. School Year: 2023/2024 2022/2023. Competition: AIME I - 2024 AIME II - 2024 AMC 10 A - Fall 2023 AMC 10 B - Fall 2023 AMC 12 A - Fall 2023 AMC 12 B - Fall 2023 AMC 8 - 2024. View as PDF.AMC 10A. The 2024 AMC 10A has not yet happened; do not believe any statistics you see here. Average Score: AIME Floor: Distinction: Distinguished Honor Roll: AMC 10B. The 2024 AMC 10B has not yet happened; do not believe any statistics you see here. Average Score: AIME Floor: Distinction: Distinguished Honor Roll: AMC 12AThe rest contain each individual problem and its solution. 2003 AMC 10A Problems. Answer Key. 2003 AMC 10A Problems/Problem 1. 2003 AMC 10A Problems/Problem 2. 2003 AMC 10A Problems/Problem 3. 2003 AMC 10A Problems/Problem 4. 2003 AMC 10A Problems/Problem 5. 2003 AMC 10A Problems/Problem 6.12 Nov 2022 ... AMC 10A 2022 2023 full solutions questions problems| American Mathematics Competitions Olympiad Math. Math Gold Medalist•9.7K views · 2:24 · Go ....Nov 9, 2023 · By now, many students and parents in the math competition community are aware of leaks of problems for the AMC 10A and 12A math contests that were held on Wednesday, November 8th, 2023. Reports of the leak surfaced the weekend before the exam with a change.org petition being started on November 4th asking the MAA to take action to preserve Solution 1. Note Euler's formula where . There are faces and the number of edges is because there are 12 faces each with four edges and each edge is shared by two faces. Now we know that there are vertices on the figure. Now note that the sum of the degrees of all the points is twice the number of edges. Let the amount of vertices with edges.

Solution 1. In order for the divisor chosen to be a multiple of , the original number chosen must also be a multiple of . Among the first positive integers, there are 9 multiples of 11; 11, 22, 33, 44, 55, 66, 77, 88, 99. We can now perform a little casework on the probability of choosing a divisor which is a multiple of 11 for each of these 9 .... Fagox stock

amc 10a 2023

Solution 3. The perpendicular bisector of a line segment is the locus of all points that are equidistant from the endpoints. The question then boils down to finding the shapes where the perpendicular bisectors of the sides all intersect at a point. This is true for a square, rectangle, and isosceles trapezoid, so the answer is .AMC hosts a series of challenges such as AMC8 held in January for grade 8 or below, AMC10/12 held in November for students at/below grade 10/12. ... The cut-off score is 111 points in 2023 (10A); The cut-off score is 112.5 points in 2023 (10B). AMC10 Achievement Roll Get 90 and more scores in grade 8 and below. School Awards. School Honor RollDec 19, 2023 - Jan 11, 2024. $113.00. Final day to order additional bundles for the 8. Jan 11, 2024. AMC 8 Competition: Jan 18 - 24, 2024.2022 AMC 10A problems and solutions. The test was held on Thursday, November 10, 2022. 2022 AMC 10A Problems. 2022 AMC 10A Answer Key. Problem 1.The Maryam Mirzakhani AMC 10 A Awards and Certificates honor top-performing girls on the AMC 10 A. The top five scorers split a monetary award of $5000, and the top five scorers from each MAA section receive a Certificate of Excellence.. Awards and Certificates for the AMC 10 A are made possible by Awesome Math Girls.It is named after Maryam …A small AMC Movie Theatre popcorn, without butter, equates to 11 points at Weight Watchers. It contains 400 to 500 calories. The butter topping increases the Weight Watchers point ...2023 AMC 10A problems and solutions. The test was held on Wednesday, November 8, 2023. 2023 AMC 10A Problems; 2023 AMC 10A Answer Key. Problem 1; …The 2022 AMC 10A/12A will be held on Thursday, November 10, 2022. We posted the 2022 AMC 10A Problems and Answers, and 2022 AMC 12A Problems and Answers at 8:00 a.m. on November 11, 2022. Your attention would be very much appreciated. More details can be found at: Every Student Should Take Both the AMC … Ritvik Rustagi's FREE AMC 10/12 Book (200+ Pages and 250+ Problem with detailed solutions) Hello Everyone, I am extremely happy to announce the release of my new free book called ACE The AMC 10 and AMC 12. In January 2021, I released a 53 page AMC 10/12 handout that a lot of people benefited from. Now after almost 3 years, I decided to release ... Solution 2. We proceed similarly to solution one. We get that . Expanding, we get that . We know that , so the sum of the coefficients of the cubic expression is equal to one. Thus . Solving for a, we get that a=23/24. Therefore, our answer is. ~Aopsthedude. NYC Math Team Selection. Selection is done in the Spring of each year. To be considered, students should have taken the most recent AMC 10 or AMC 12 exam and know their scores. If you are interested in joining the team, be sure to take the AMC 10/12. To improve your chances, you can take both the AMC 10A/12A and the AMC 10B/12B.昨天,2023年 amc10 /12 a卷考试已经圆满结束!同学们纷纷前来反馈,对题目的感受各有千秋! 无论成绩好坏,这次考试都是激励我们未来努力的契机。对于那些报名参加ab卷的同学们来说,现在还不是松懈的时候,多巩固一些知识点,就能增加几分胜算! amc 10a试题 ....

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