第66页 - 经纶学典学霸七年级数学上下册【江苏国标】

B

D

B

x(x-y)

$xy(6+3x-4xz^3)$

(x-2)(x-1)

$4x^my^{n-1}$

-5x+2y

$解：原式=-3ab²(5a²-3a+b).$

$ \begin{aligned}解：原式&=(a-b)²+(a-b) \\ &=(a-b)(a-b+1) \\ \end{aligned}$

$ \begin{aligned}解：原式&=(2a+b)(2a-b)+2b(2a+b) \\ &=(2a+b)² \\ \end{aligned}$

$ \begin{aligned}解：原式&=x²(a-1)-x(a-1) \\ &=(a-1)(x²-x) \\ &=x(a-1)(x-1) \\ \end{aligned}$

D

130

0

-2025

68000

2