第42页 - 江苏版实验班提优训练数学七年级上下册答案

A

B

×

$-6x⁵$

×

$12a^4$

×

$24b⁶$

×

$-6x²y$

×

$6ab$

$6x³y$

$ \begin{aligned}解：原式&=x⁴·4x²y⁴ \\ &=4x⁶y⁴. \\ \end{aligned}$

$ \begin{aligned} 解：原式&=[-8×(-1)×\frac{1}{4}]a²·a³·b·b²·b² \\ &= 2a⁵b⁵. \\ \end{aligned}$

C

B

$\frac{3n}{m} $

1

2

576

$-36m⁶n³ $

$ \begin{aligned}解：原式&=[2×(-2)×(-\frac{1}{2})](m²·mn·m²n³) \\ &=2m⁵n⁴. \\ \end{aligned}$