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美国数学竞赛AMC8

排列组合(permutation and combination)

小测验-排列组合1

尺规作图Compass-and-straightedge

尺规作图-正三边形

尺规作图-正四边形

尺规作图-正五边形

尺规作图-正六边形

尺规作图-正七边形（近似）

尺规作图-正八边形

尺规作图-正九边形（近似）

三角形内心、外心、重心、垂心、旁心、费马点

数论(number theory)

数论一小测验

数字填空小测验

Perimeter and Area 周长与面积

Basic Formulas for Perimeters and Area 周长与面积的基本公式

the song from Pi

平行四边形

factorization by cross method

因式分解(Divisibility)

整式乘除小测验

平面直角坐标系

平面直线方程

直角坐标系-小测验

Operation with Fractions

Word Problems Related to Percentage

Transformations

consecutive integers

operations with Decimals

Set and Venn Diagrams

counting Techniques

Geometric Visualization

Ratio,Rate and Proportion

Least common Multiple and Greatest Common Factor

solving Equations

Special Symbols and Operations

Sequences and Series

1 of 2

整式乘除小测验

美国数学竞赛AMC8
因式分解(Divisibility)
整式乘除
整式乘除小测验

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Question 1 of 4

1. Question

1、计算式子: $https://latex.codecogs.com/svg.image?\left ( -3a^2b \right )\cdot \left ( -2a^{2m-1} \right )$

A. $https://latex.codecogs.com/svg.image?6a^{2m-5}b$
Correct Incorrect Correct answer

B. $https://latex.codecogs.com/svg.image?-6a^{4m-6}b$
Correct Incorrect Correct answer

C. $https://latex.codecogs.com/svg.image?6a^{2m-1}b$
Correct Incorrect Correct answer

D. $https://latex.codecogs.com/svg.image?-6a^{2m-1}b$
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Correct

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Question 2 of 4

2. Question

2、计算式子: $https://latex.codecogs.com/svg.image?\left (x-y \right )^3\cdot \left ( y-x \right )^5$

A. $https://latex.codecogs.com/svg.image?\left (x-y\right )^8$
Correct Incorrect Correct answer

B. $https://latex.codecogs.com/svg.image?\left (x-y\right )^{15}$
Correct Incorrect Correct answer

C. $https://latex.codecogs.com/svg.image?-\left (x-y\right )^{8}$
Correct Incorrect Correct answer

D. $https://latex.codecogs.com/svg.image?-\left (x-y\right )^{15}$
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Correct

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Question 3 of 4

3. Question

3、下列算式中正确的是( )

A. $https://latex.codecogs.com/svg.image?3a^3\cdot2a^2=6a^6$
Correct Incorrect Correct answer

B. $https://latex.codecogs.com/svg.image?2x^3\cdot3x^5=8x^8$
Correct Incorrect Correct answer

C. $https://latex.codecogs.com/svg.image?3x\cdot3x^4=9x^4$
Correct Incorrect Correct answer

D. $https://latex.codecogs.com/svg.image?5y^7\cdot5y^7=10x^{14}$
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Question 4 of 4

4. Question

4、 $https://latex.codecogs.com/svg.image?-\frac{1}{2}m^2n\cdot(-mn^2x)$ 的结果是( )

A. $https://latex.codecogs.com/svg.image?\frac{1}{2}m^4n^2x$
Correct Incorrect Correct answer

B. $https://latex.codecogs.com/svg.image?\frac{1}{2}m^3n^3$
Correct Incorrect Correct answer

C. $https://latex.codecogs.com/svg.image?\frac{1}{2}m^3n^3x$
Correct Incorrect Correct answer

D. $https://latex.codecogs.com/svg.image?-\frac{1}{2}m^3n^3x$
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Correct

Incorrect

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