若a+b=5,ab=3,求代数式a的三次方b-2a的平方b的平方+ab的三次方
帮我解一下
人气：372 ℃ 时间：2019-08-20 15:58:19
解答
ab-2ab+ab =ab(a-2ab+b) =ab(a+2ab+b-4ab) =ab[(a+b)-4ab] =3×(5-12) =39
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