因式分解(x+y)^2-(x-y)^2=
问题描述:
因式分解(x+y)^2-(x-y)^2=
答
慢了
答
(x+y)²-(x-y)²
=(x+y+x-y)(x+y-x+y)
=2x×2y
=4xy
答
使用平方差公式
原式
=【(x+y)+(x-y)】【(x+y)-(x-y)】
=2x乘以2y
=4xy
答
(x+y+x-y)(x+y-x+y)
=2x×2y
=4xy