两数和立方证明:
(a+b)³=(a+b)²(a+b)=(a²+2ab+b²)(a+b)
=a³+3a²b+3ab²+b³
两数差立方证明:
=a³-2a²b+ab²-a²b+2ab²-b³
=a³-3a²b+3ab²-b³
立方和公式
两数之和与两数之差公式推导,在线求解答
两数和立方证明:
(a+b)³=(a+b)²(a+b)=(a²+2ab+b²)(a+b)
=a³+3a²b+3ab²+b³
两数差立方证明:
=a³-2a²b+ab²-a²b+2ab²-b³
=a³-3a²b+3ab²-b³
立方和公式