来自倪礼真的问题
(3x+2m)²-(x-2m)²
(3x+2m)²-(x-2m)²
1回答
2020-09-09 09:13
(3x+2m)²-(x-2m)²
(3x+2m)²-(x-2m)²
(3x+2m)²-(x-2m)²=【(3x+2m)+(x-2m)】【(3x+2m)-(x-2m)】
=4x*(2x+4m)=8x*(x+2m)(主要利用平方差公式)