第32页 - 启东中学作业本七年级数学苏科版宿迁专版

B

D

$-x^3y^6$

$\frac{27}{64}x^9y^6$

1

8

$ \begin{aligned} 解：原式&=(-2)^2(x^3)^2y^2 \\ &=4x^6y^2 \\ \end{aligned}$

$ \begin{aligned} 解：原式&=x^m(y^2)^m \\ &=x^my^{2m} \\ \end{aligned}$

$ \begin{aligned}解：原式&=(-\frac13)^3(a^n)^3(b^n)^3 \\ &=-\frac{1}{27}a^{3n}b^{3n} \\ \end{aligned}$

$ \begin{aligned}解：原式&=(-2)^3[(x+y)^2]^3 \\ &=-8(x+y)^6 \\ \end{aligned}$

$ \begin{aligned} 解：原式&=(-2)^2(a^2)^2+a^{(3+1)} \\ &=4a^4+a^4 \\ &=5a^4 \\ \end{aligned}$

$ \begin{aligned} 解：原式&=(-1)^3(m^2)^3-m^4·m^2 \\ &=-m^6-m^{(4+2)} \\ &=-m^6-m^6 \\ &=-2m^6 \\ \end{aligned}$

A

D

B