计算 (a+b)(a²-ab+b²)-(a+b)²
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计算 (a+b)(a²-ab+b²)-(a+b)²
计算 (a+b)(a²-ab+b²)-(a+b)²
计算 (a+b)(a²-ab+b²)-(a+b)²
(a+b)(a²-ab+b²)-(a+b)²=a³+b³-a²-2ab-b²
(a+b)(a²-ab+b²)-(a+b)²=(a+b)³-(a+b)²=(a+b)²(a+b-1)
(a+b)(a²-ab+b²)-(a+b)²
= (a+b)(a²-ab+b²-a-b)
=(a+b)²(a+b-1)