#高考提分#分解因式的这种题怎么做? (x-y)²+2(x-y)(x+y)+(y-x)²
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解:原式=(x-y)²+2(x-y)(x+y)+(x-y)²
=(x-y)((x-y)+2(x+y)+(x-y))
=(x-y)(x-y+2x+2y+x-y)
=4x(x-y)
=(x-y)((x-y)+2(x+y)+(x-y))
=(x-y)(x-y+2x+2y+x-y)
=4x(x-y)
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(x-y)²+2(x-y)(x+y)+(y-x)²=2(x-y)²+2(x-y)(x+y)=2(x-y)(x-y+x+y)=4x(x-y)
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