已知X-Y=2,xy=二分之一,求x的三次方y-2x的平方y的平方+xy的三次方的值
好的追分!今天要
人气：452 ℃ 时间：2019-08-18 19:46:38
解答
x³y-2x²y+xy
=xy(x²-2x+1)
=xy(x-y)²
=1/2×2²
=2
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