已知a+b=1\2,ab=3\8,a^3b+2a^2b^2-ab^3的值
人气:428 ℃ 时间:2020-05-21 09:26:41
解答
因为a+b=1/2,ab=3\8,则(a-b)^2=(a+b)^2-4ab
a^3b+2a^2b^2-ab^3=ab(a^2-b^2)+2(ab)^2=ab(a-b)(a+b)+2(ab)^2
由于时间关系,答案你自己算,过程已经都给出了
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