已知 x（x-1）-（x^2-y)= - 3 求x^2+y^2-2xy
已知 x（x-1）-（x^2-y)= - 3 求x^2+y^2-2xy
x^2 就是x的平方
人气：458 ℃ 时间：2020-09-17 15:53:30
解答
x^2-x-x^2+y= - 3 可知 x-y=3
x^2+y^2-2xy=(x-y)^2=9
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