分解因式a³-3a²b+3ab²-b³
问题描述:
分解因式a³-3a²b+3ab²-b³
答
a³-3a²b+3ab²-b³
=(a³-b³)-(3a²b-3ab²)
=(a-b)(a²+ab+b²)-3ab(a-b)
=(a-b)(a²+ab+b²-3ab)
=(a-b)(a²-2ab+b²)
=(a-b)(a-b)²
=(a-b)³