a三次方减去b的三次方等于多少

2025-04-13 17:42:50
推荐回答(1个)
回答1:

a³-b³
=a³-a²b+a²b-b³
=a²(a-b)+b(a²-b²)
=a²(a-b)+b(a+b)(a-b)
=(a-b)[a²+b(a+b)]
=(a-b)(a²+ab+b²)