a³-b³怎么因式分解成(b-a)(b²+a²+ab)
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a³-b³怎么因式分解成(b-a)(b²+a²+ab)
a³-b³怎么因式分解成(b-a)(b²+a²+ab)
a³-b³怎么因式分解成(b-a)(b²+a²+ab)
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)
你的错了