计算:(a+b)(a²-ab+b²)-(a+b)²(要步骤)
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计算:(a+b)(a²-ab+b²)-(a+b)²(要步骤)
计算:(a+b)(a²-ab+b²)-(a+b)²(要步骤)
计算:(a+b)(a²-ab+b²)-(a+b)²(要步骤)
(a+b)(a²-ab+b²)-(a+b)²
=a³+b³-(a+b)²
=a³+b³-(a²+2ab+b²)
=a³+b³-a²-2ab-b²
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(a+b)(a²-ab+b²)-(a+b)²
=a^3-a^2b+ab^2+a^2b-ab^2+b^3-(a^2+2ab+b^2)
=a^3+b^3-a^2-2ab-b^2
(a+b)(a²-ab+b²)-(a+b)²
=(a+b)(a²-ab+b²-a-b)