第14页 - 启东中学作业本七年级数学苏科版宿迁专版

乘方

相乘

$a^nb^n$

A

$-\frac{1}{27}x^6$

$1.6×10^9$

1

2m²

±3a⁶

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

$ \begin{aligned}解：原式&=(\frac{2}{3})^3·x^3·(y^2)^3 \\ &=\frac{8}{27}x^3y^6. \\ \end{aligned}$

$ \begin{aligned} 解：原式&=-(-\frac{1}{2})^4·(x^3)^4·y^4 \\ &=-\frac{1}{16}x^{12}y^{4}. \\ \end{aligned}$

$ \begin{aligned}解：原式&=-8x^{6}+9x^{6} \\ &=x^{6}. \\ \end{aligned}$