已知(4x-2y-1)的平方+|xy-2|=0,求2x的平方y-xy的平方+xy的值
人气:122 ℃ 时间:2019-10-04 12:37:38
解答
根据题意可知
4x-2y-1=0
2(2x-y)=1
2x-y=1/2
xy-2=0
xy=2
2x^2y-xy2+xy
=xy(2x-y+1)
=2(1/2+1)
=3
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