化简(a-b)(a b)²-(a b)(a-b)² 2b(a² b²)

化简(a-b)(a b)²-(a b)(a-b)² 2b(a² b²)
化简(a-b)(a b)²-(a b)(a-b)² 2b(a² b²)

化简(a-b)(a b)²-(a b)(a-b)² 2b(a² b²)
(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²)
=[(a+b)-(a-b)](a-b)(a+b)+2b(a²+b²)
=2b(a²-b²)+2b(a²+b²)
=2b[(a²-b²)+(a²+b²)]
=2b(2a)²
=4a²b
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