11.C 12.A 13.B 14.E 15.D 16.C 17.D 18.E 19.C 20.B 21.A 22.D 23.D 24.D 25.E 2ProblemsandSolutions Problem1.Whatisthevalueof 21+2+3-(2¹+2²+23)? (A)0(B)50(C)52(D)54(E)57 Solution.2⁶-(2¹+2²+23)=64-(2+4+8)=64-14=(B)50 ...
2021年美国数学竞赛AMC-12A 真题加答案解析(英文版)
At least one of is divisible by , from which it follows that and . The sum of these numbers is thus , a prime, so the answer is . Problem 12 For how many integers is the square of an integer? Solution Solution 1 Let , with (note that the solutions do not give any additional ...
AMC 12A 2012 Problems & Answers USA AMC 12/AHSME 2012 1 A bug crawls along a number line, starting at . It crawls to , then turns around and crawls to . How many units does the bug crawl altogether? 2 Cagney can frost a cupcake every seconds and Lacey can frost a cupcake every ...
Students in grade 12 or below and under 19.5 years of age on the day of the contest can take the AMC 12. Dates: Contest A: Thursday, February 4th, 2021 Contest B: Wednesday, February 10th, 2021 Download the AMC 12 problems and solutions below: ...
2002 AMC 12B Problems and Solution Problem 1 The arithmetic mean of the nine numbers in the set is a digit number all of,人人文库,
2017 AMC 12B 2017 AMC 12B 2017 AMC 12A problems and solutions. The test was held on February 7, 2017. Problem 1 Kymbrea's comic book collection currently has comic books in it, and she is adding to her collection at the rate of comic books per month. LaShawn's collection currently ...
12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25All AMC 12 Problems and SolutionsThe problems on this page are copyrighted by the Mathematical Association of America (http://www.maa.org)'s AmericanMathematics Competitions (...
12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 All AMC 12 Problems and Solutions The problems on this page are copyrighted by the Mathematical Association of America ()s American Mathematics Competitions (). Retrieved from /...
c=182&cid=44&year=2020)) Preceded by FirstProblem Followed by Problem2 1•2•3•4•5•6•7•8•9•10•11•12•13•14•15•16•17•18•19•20•21•22•23•24•25 AllAMC12ProblemsandSolutions TheproblemsonthispagearecopyrightedbytheMathematical...