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(x+y-xy-1)^2=(x-1)^2(y-1)^2
(x+y-xy-1)^2这步是怎么变到(x-1)^2(y-1)^2这步的?
人气:194 ℃ 时间:2020-06-21 02:25:33
解答
(x+y-xy-1)^2
=(x(1-y)-(1-y))^2
=((x-1)(1-y))^2
=(x-1)^2(1-y)^2
=(x-1)^2(y-1)^2
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