(a+b)²-4(a-b)²

问题描述:

(a+b)²-4(a-b)²

(a+b)²-4(a-b)²
=(a+b)²-[2(a-b)]²
=[(a+b)-2(a-b)][(a+b)+2(a-b)]
=(3b-a)(3a-b)

(a+b)²-4(a-b)²
=[(a+b)+2(a-b)][(a+b)-2(a-b)]
=(3a-b)(-a+3b)
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