(x+y)²-2(x+y)(x-y)+(x-y)²(要求:写明原因、最简单的方法)
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(x+y)²-2(x+y)(x-y)+(x-y)²(要求:写明原因、最简单的方法)
(x+y)²-2(x+y)(x-y)+(x-y)²(要求:写明原因、最简单的方法)
(x+y)²-2(x+y)(x-y)+(x-y)²(要求:写明原因、最简单的方法)
(x+y)²-2(x+y)(x-y)+(x-y)² [直接逆用完全平方公式(a-b)²=a²-2ab+b²,其中a=(x+y),b=(x-y)]
=[(x+y)-(x-y)]²
=[2y]²
=4y²