计算(a+b)³,,,(a-b)³
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(a+b)³
=(a+b)(a+b)²
=(a+b)(a²+2ab+b²)
=a³+2a²b+ab²+a²b+2ab²+b³
=a³+3a²b+3ab²+b³
(a-b)³
=(a-b)(a-b)²
=(a-b)(a²-2ab+b²)
=a³-2a²b+ab²-a²b+2ab²-b³
=a³-3a²b+3ab²-b³
=(a+b)(a+b)²
=(a+b)(a²+2ab+b²)
=a³+2a²b+ab²+a²b+2ab²+b³
=a³+3a²b+3ab²+b³
(a-b)³
=(a-b)(a-b)²
=(a-b)(a²-2ab+b²)
=a³-2a²b+ab²-a²b+2ab²-b³
=a³-3a²b+3ab²-b³
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