计算(a+b)〔(a-b)²+ab〕-(a-b)〔(a+b)²-ab〕
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计算(a+b)〔(a-b)²+ab〕-(a-b)〔(a+b)²-ab〕
计算(a+b)〔(a-b)²+ab〕-(a-b)〔(a+b)²-ab〕
计算(a+b)〔(a-b)²+ab〕-(a-b)〔(a+b)²-ab〕
=(a+b)(a²-2ab+b²+ab) -(a-b)(a²+2ab+b²-ab)
=(a+b)(a²-ab+b²)-(a-b)(a²+ab+b²)
=a³+b³-a³+b³
=2b³