已知a+b=6,ab=4,求a²b+3a²b²=ab²的值
人气：460 ℃ 时间：2020-02-05 23:29:13
解答
a²b+3a²b²+ab²
=a²b+ab²+3a²b²
=ab(a+b)+3(ab)²
=4×6+3×4²
=24+48
=72
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