
2025-04-01 04:02:21
精选答案
解: 立方利用这个公式化简: (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)²(a-b) =(a²-2ab+b²)(a-b) =a³-a²b-2a²b+2ab²+ab²-b³ =a³-3a²b+3ab²-b³
2025-04-01 04:02:21
其他答案
解:立方利用这个公式化简:(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)²(a-b)=(a²-2ab+b²)(a-b)=a³-a²b-2a²b+2ab²+ab²-b³=a³-3a²b+3ab²-b³