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数学
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因式分解a^3+a^2b+ab^2-b^3
人气:205 ℃ 时间:2020-02-03 04:32:09
解答
a³+a²b+ab²-b³
=a(a²+b²)+b(a²-b²)
=a(a²-b²)+b(a²-b²)-2ab²
=(a+b)²(a-b)-2ab²
是不是有符号不对啊?
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