第30页 - 江苏版启东中学作业本七年级数学（上下册）

C

B

C

$a^6$

x²⁷

x¹²

-x²

4

72

$ \begin{aligned} 解:原式&=(-m)^{12} \\ &=m^{12}. \\ \end{aligned}$

$ $

$ \begin{aligned} 解:原式&=a^{2(3-m)} \\ &=a^{6-2m}. \\ \end{aligned}$

$ $

$ \begin{aligned} 解:原式&=(2x-y)^{2×5} \\ &=(2x-y)^{10}. \\ \end{aligned}$

$ $

$ \begin{aligned} 解:原式&=(x+y)^{3(a+1)} \\ &=(x+y)^{3a+3} \\ \end{aligned}$

$ \begin{aligned} 解:原式&=-a^2.a^6 \\ &= -a^8. \\ \end{aligned}$

$ $

$ \begin{aligned} 解:原式&=y^6.(-y^{12}).y \\ &=-y^{19}. \\ \end{aligned}$

$ $

C

10或6

$ \begin{aligned} 解:原式&=a^8+(-a^6)·a^2 \\ &=a^8-a^8 \\ &=0. \\ \end{aligned}$

$ $

$ \begin{aligned} 解:原式&=(x^8)^2+x^2·x^6·x^8 \\ &=x^{16}+x^{16} \\ &=2x^{16}. \\ \end{aligned}$

$ $