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2013

2013 AMC10 真题及解析2013 AMC10 Paper & Solutions 精选Pick A卷Paper A

25 题含解析,代数应用题突出,几何涉及勾股定理。25 questions with solutions, strong algebra word problems, geometry covers Pythagorean theorem.

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25 道选择题25 Questions
75 分钟限时40 Minutes
满分 150 分Max Score 25
不可用计算器No Calculator
Exam Overview

考试概览Exam Overview

代数应用题突出,几何涉及勾股定理。This exam emphasizes algebra, geometry, word problems. Overall difficulty is moderate.

D难度分布Difficulty

  • Easy 基础Easy第 1-10 题Q1-10
  • Medium 中等Medium第 11-20 题Q11-20
  • Hard 较难Hard第 21-25 题Q21-25

T考点分布Topics

  • 代数Algebra40%
  • 几何Geometry25%
  • 数论Number Theory15%
  • 组合Combinatorics20%

A奖项分数线Awards

DHR 卓越荣誉奖AIME Qualification
AIME Qualification (Top 2.5%)
103+
HR 荣誉奖Honor Roll
Honor Roll (Top 5%)
98+
Achievement Roll
六年级及以下 · 15分以上Grade 6 and below · 15+ points
89+
Sample Problems

2013 AMC10 真题参考示例(共 12 题)2013 AMC10 Sample Problems (12 questions)

以下为 Easy / Medium / Hard 难度参考示例题目,仅供练习参考,点击选项查看答案Sample reference problems by difficulty — click an option to check your answer

第 1 题Q1Easy多项式求值Polynomial
若 f(x) = 2x² - 6x + 2,求 f(3) 的值。If f(x) = 2x² - 6x + 2, find f(3).
A) 0
B) 4
C) 6
D) 2
E) 8

解题步骤Steps

1f(3) = 2×3² - 6×3 + 2
2= 2×9 - 18 + 2 = 2
正确答案:DAnswer: D代入后先乘方再乘除最后加减Substitute, then exponentiate, multiply/divide, add/subtract
第 3 题Q3Easy等差数列Arithmetic Seq
等差数列首项 a₁=4,公差 d=5,求第 11 项。Arithmetic sequence: a₁=4, d=5, find the 11-th term.
A) 42
B) 48
C) 60
D) 66
E) 54

解题步骤Steps

1aₙ = a₁ + (n-1)d
2a_11 = 4 + 10×5 = 54
正确答案:EAnswer: E通项公式 aₙ = a₁ + (n-1)dGeneral term: aₙ=a₁+(n-1)d
第 5 题Q5Easy指数运算Exponent
若 3ˣ = 81,求 x 的值。If 3ˣ = 81, find x.
A) 4
B) 2
C) 3
D) 5
E) 6

解题步骤Steps

181 = 3^4
2故 x = 4
正确答案:AAnswer: A化为同底数幂,比较指数Convert to same base, compare exponents
第 7 题Q7Easy韦达定理Vieta's
方程 x² - 8x + 5 = 0 的两根之和是多少?Sum of roots of x² - 8x + 5 = 0?
A) 4
B) 8
C) 6
D) 10
E) 12

解题步骤Steps

1韦达定理:两根之和 = -(-8)/1 = 8
2两根之积 = 5
正确答案:BAnswer: Bx²-px+q=0 两根之和为 pFor x²-px+q=0, sum of roots = p
第 10 题Q10Medium整除计数Divisibility
从 1 到 43 的正整数中,有多少个能被 4 整除?How many integers from 1 to 43 are divisible by 4?
A) 6
B) 8
C) 10
D) 12
E) 14

解题步骤Steps

1⌊43 / 4⌋ = 10
正确答案:CAnswer: C能被 k 整除的个数 = ⌊n/k⌋Count divisible by k: ⌊n/k⌋
第 12 题Q12Medium多边形对角线Diagonals
正 8 边形共有多少条对角线?How many diagonals does a regular 8-gon have?
A) 14
B) 17
C) 23
D) 20
E) 26

解题步骤Steps

1对角线数 = n(n-3)/2
2= 8×5/2 = 20
正确答案:DAnswer: Dn 边形对角线公式 n(n-3)/2n-gon diagonals: n(n-3)/2
第 15 题Q15Medium组合数Combination
计算 C(9, 3) 的值。Compute C(9, 3).
A) 66
B) 75
C) 93
D) 102
E) 84

解题步骤Steps

1C(n,3) = n(n-1)(n-2)/6
2= 9×8×7/6 = 84
正确答案:EAnswer: E组合数公式 C(n,k)=n!/(k!(n-k)!)Combination: C(n,k)=n!/(k!(n-k)!)
第 17 题Q17Medium勾股定理Pythagorean
直角三角形两直角边长为 8 和 15,求斜边长。Right triangle legs 8 and 15, find the hypotenuse.
A) 17
B) 13
C) 15
D) 19
E) 21

解题步骤Steps

1c² = 8² + 15² = 64 + 225 = 289
2c = √289 = 17
正确答案:AAnswer: A勾股定理 a²+b²=c²Pythagorean theorem a²+b²=c²
第 20 题Q20Hard模运算Modular Arith
求 4^5 除以 6 的余数。Find the remainder of 4^5 divided by 6.
A) 2
B) 4
C) 3
D) 5
E) 6

解题步骤Steps

1计算 4^5 mod 6
2由模运算性质逐步化简
3=4
正确答案:BAnswer: B模运算可逐步取余简化大指数Modular arithmetic simplifies large exponents
第 22 题Q22Hard配方法Completing Sq
函数 f(x) = x² - 6x + 13 的最小值是多少?Find the minimum of f(x) = x² - 6x + 13.
A) 0
B) 2
C) 4
D) 6
E) 8

解题步骤Steps

1配方:f(x) = (x - 3)² + 4
2当 x = 3 时取最小值 4
正确答案:CAnswer: C配方法是求二次函数最值的标准方法Completing the square for quadratic extrema
第 24 题Q24Hard容斥原理Inclusion-Excl
将 5 个不同球放入 3 个不同盒子,每盒至少 1 球,有多少种放法?5 distinct balls into 3 distinct boxes, each ≥1 ball, how many ways?
A) 118
B) 134
C) 166
D) 150
E) 182

解题步骤Steps

1总数 3^5 = 243
2减去有空盒: -C(3,1)×2^5 = -96
3加回两个空盒: +C(3,2)×1 = +3
4总计 243 - 96 + 3 = 150
正确答案:DAnswer: D容斥原理处理"至少"条件Inclusion-exclusion handles 'at least'
第 25 题Q25Hard余弦定理Law of Cosines
△ABC 中 a=6, b=7, cos C=1/2,求 c²。In △ABC, a=6, b=7, cos C=1/2, find c².
A) 33
B) 38
C) 48
D) 53
E) 43

解题步骤Steps

1余弦定理 c² = a² + b² - 2ab·cos C
2= 36 + 49 - 42 = 43
正确答案:EAnswer: E余弦定理是解三角形的核心Law of cosines is key for solving triangles
第 1 题Q1Easy多项式求值Polynomial
若 f(x) = 2x² - 8x + 2,求 f(3) 的值。If f(x) = 2x² - 8x + 2, find f(3).
A) -8
B) -6
C) -2
D) -4
E) 0

解题步骤Steps

1f(3) = 2×3² - 8×3 + 2
2= 2×9 - 24 + 2 = -4
正确答案:DAnswer: D代入后先乘方再乘除最后加减Substitute, then exponentiate, multiply/divide, add/subtract
第 3 题Q3Easy等差数列Arithmetic Seq
等差数列首项 a₁=6,公差 d=5,求第 11 项。Arithmetic sequence: a₁=6, d=5, find the 11-th term.
A) 44
B) 50
C) 62
D) 68
E) 56

解题步骤Steps

1aₙ = a₁ + (n-1)d
2a_11 = 6 + 10×5 = 56
正确答案:EAnswer: E通项公式 aₙ = a₁ + (n-1)dGeneral term: aₙ=a₁+(n-1)d
第 5 题Q5Easy指数运算Exponent
若 3ˣ = 81,求 x 的值。If 3ˣ = 81, find x.
A) 4
B) 2
C) 3
D) 5
E) 6

解题步骤Steps

181 = 3^4
2故 x = 4
正确答案:AAnswer: A化为同底数幂,比较指数Convert to same base, compare exponents
第 7 题Q7Easy韦达定理Vieta's
方程 x² - 10x + 5 = 0 的两根之和是多少?Sum of roots of x² - 10x + 5 = 0?
A) 6
B) 10
C) 8
D) 12
E) 14

解题步骤Steps

1韦达定理:两根之和 = -(-10)/1 = 10
2两根之积 = 5
正确答案:BAnswer: Bx²-px+q=0 两根之和为 pFor x²-px+q=0, sum of roots = p
第 10 题Q10Medium整除计数Divisibility
从 1 到 45 的正整数中,有多少个能被 4 整除?How many integers from 1 to 45 are divisible by 4?
A) 7
B) 9
C) 11
D) 13
E) 15

解题步骤Steps

1⌊45 / 4⌋ = 11
正确答案:CAnswer: C能被 k 整除的个数 = ⌊n/k⌋Count divisible by k: ⌊n/k⌋
第 12 题Q12Medium多边形对角线Diagonals
正 10 边形共有多少条对角线?How many diagonals does a regular 10-gon have?
A) 29
B) 32
C) 38
D) 35
E) 41

解题步骤Steps

1对角线数 = n(n-3)/2
2= 10×7/2 = 35
正确答案:DAnswer: Dn 边形对角线公式 n(n-3)/2n-gon diagonals: n(n-3)/2
第 15 题Q15Medium组合数Combination
计算 C(11, 3) 的值。Compute C(11, 3).
A) 131
B) 148
C) 182
D) 199
E) 165

解题步骤Steps

1C(n,3) = n(n-1)(n-2)/6
2= 11×10×9/6 = 165
正确答案:EAnswer: E组合数公式 C(n,k)=n!/(k!(n-k)!)Combination: C(n,k)=n!/(k!(n-k)!)
第 17 题Q17Medium勾股定理Pythagorean
直角三角形两直角边长为 3 和 4,求斜边长。Right triangle legs 3 and 4, find the hypotenuse.
A) 5
B) 1
C) 3
D) 7
E) 9

解题步骤Steps

1c² = 3² + 4² = 9 + 16 = 25
2c = √25 = 5
正确答案:AAnswer: A勾股定理 a²+b²=c²Pythagorean theorem a²+b²=c²
第 20 题Q20Hard模运算Modular Arith
求 4^5 除以 6 的余数。Find the remainder of 4^5 divided by 6.
A) 2
B) 4
C) 3
D) 5
E) 6

解题步骤Steps

1计算 4^5 mod 6
2由模运算性质逐步化简
3=4
正确答案:BAnswer: B模运算可逐步取余简化大指数Modular arithmetic simplifies large exponents
第 22 题Q22Hard配方法Completing Sq
函数 f(x) = x² - 6x + 15 的最小值是多少?Find the minimum of f(x) = x² - 6x + 15.
A) 2
B) 4
C) 6
D) 8
E) 10

解题步骤Steps

1配方:f(x) = (x - 3)² + 6
2当 x = 3 时取最小值 6
正确答案:CAnswer: C配方法是求二次函数最值的标准方法Completing the square for quadratic extrema
第 24 题Q24Hard容斥原理Inclusion-Excl
将 5 个不同球放入 3 个不同盒子,每盒至少 1 球,有多少种放法?5 distinct balls into 3 distinct boxes, each ≥1 ball, how many ways?
A) 118
B) 134
C) 166
D) 150
E) 182

解题步骤Steps

1总数 3^5 = 243
2减去有空盒: -C(3,1)×2^5 = -96
3加回两个空盒: +C(3,2)×1 = +3
4总计 243 - 96 + 3 = 150
正确答案:DAnswer: D容斥原理处理"至少"条件Inclusion-exclusion handles 'at least'
第 25 题Q25Hard余弦定理Law of Cosines
△ABC 中 a=8, b=7, cos C=1/2,求 c²。In △ABC, a=8, b=7, cos C=1/2, find c².
A) 45
B) 51
C) 63
D) 69
E) 57

解题步骤Steps

1余弦定理 c² = a² + b² - 2ab·cos C
2= 64 + 49 - 56 = 57
正确答案:EAnswer: E余弦定理是解三角形的核心Law of cosines is key for solving triangles

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