美国数学竞赛AMC8

排列组合(permutation and combination)

1 Quiz

小测验-排列组合1

尺规作图Compass-and-straightedge

8 Topics

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)

1 Topic | 2 Quizzes

数论一小测验

数字填空小测验

Perimeter and Area 周长与面积

5 Topics

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

the song from Pi

3 Topics

平行四边形

factorization by cross method

因式分解(Divisibility)

1 Topic | 1 Quiz

整式乘除小测验

平面直角坐标系

1 Quiz

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

1 Quiz

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. $https://latex.codecogs.com/svg.image?6a^{2m-5}b$
- B. $https://latex.codecogs.com/svg.image?-6a^{4m-6}b$
- C. $https://latex.codecogs.com/svg.image?6a^{2m-1}b$
- D. $https://latex.codecogs.com/svg.image?-6a^{2m-1}b$
Correct

Incorrect
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. $https://latex.codecogs.com/svg.image?\left (x-y\right )^8$
- B. $https://latex.codecogs.com/svg.image?\left (x-y\right )^{15}$
- C. $https://latex.codecogs.com/svg.image?-\left (x-y\right )^{8}$
- D. $https://latex.codecogs.com/svg.image?-\left (x-y\right )^{15}$
Correct

Incorrect
Question 3 of 4

3. Question
3、下列算式中正确的是( )
- A. $https://latex.codecogs.com/svg.image?3a^3\cdot2a^2=6a^6$
- B. $https://latex.codecogs.com/svg.image?2x^3\cdot3x^5=8x^8$
- C. $https://latex.codecogs.com/svg.image?3x\cdot3x^4=9x^4$
- D. $https://latex.codecogs.com/svg.image?5y^7\cdot5y^7=10x^{14}$
Correct

Incorrect
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. $https://latex.codecogs.com/svg.image?\frac{1}{2}m^4n^2x$
- B. $https://latex.codecogs.com/svg.image?\frac{1}{2}m^3n^3$
- C. $https://latex.codecogs.com/svg.image?\frac{1}{2}m^3n^3x$
- D. $https://latex.codecogs.com/svg.image?-\frac{1}{2}m^3n^3x$
Correct

Incorrect

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