(x-y)的平方-(x+y)的平方怎么计算?

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(x-y)的平方-(x+y)的平方怎么计算?

(x-y)的平方-(x+y)的平方怎么计算?
(x-y)的平方-(x+y)的平方怎么计算?

(x-y)的平方-(x+y)的平方怎么计算?
(x-y)的平方-(x+y)的平方
运用平方差公式得:
=【(x-y)+(x+y)】【(x-y)-(x+y)】
=2x(-2y)
= -4xy

(x-y)的平方-(x+y)的平方
=(x-y+x+y)(x-y-x-y)
=2x(-2y)
=-4xy

原式=((x-y)+(x+y))*((x-y)-(x+y))=2x*(-2y)=-4xy

(x-y)²-(x+y)²
=[(x-y)+(x+y)][(x-y)-(x+y)]
=2x*2y
=4xy


(x-y)²-(x+y)²
=【(x-y)+(x+y)】【(x-y)-(x+y)】
=(x-y+x+y)(x-y-x-y)
=2x * (-2y)
=-4xy