已知a-2b=½,ab=2.求a³b-4a²b²+4ab³的值.
人气：491 ℃ 时间：2020-02-06 10:15:15
解答
a³b-4a²b²+4ab³
=ab(a^2-4ab+4b^2)
=ab(a-2b)^2
=2*(1/2)^2
=1/2
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