因式分解m²+2m(m-n)+(m-n)²,16-8（x-y）+（x-y）²

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m²+2m(m-n)+(m-n)²
=(m+m-n)²
=(2m-n)²
16-8（x-y）+（x-y）²
=[4-(x+y)]²
=(4-x-y)²

m²+2m(m-n)+(m-n)²
=(m+m-n)²
=(2m-n)²

16-8（x-y）+（x-y）²
=[4-(x-y)]²
=(4-x+y)²