x-y=1 xy=-2,则(x+1)(y-1)等于?
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x-y=1 xy=-2,则(x+1)(y-1)等于?
![x-y=1 xy=-2,则(x+1)(y-1)等于?](/uploads/image/z/3202427-11-7.jpg?t=x-y%3D1+xy%3D-2%2C%E5%88%99%28x%2B1%29%28y-1%29%E7%AD%89%E4%BA%8E%3F)
(x+1)(y-1)
=xy-x+y-1
=xy-(x-y)-1
=-2-1-1
=-4
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=xy-x+y-1
=xy-(x-y)-1
=-2-1-1
=-4
数学辅导团为您解答,
如果不能请追问,我会尽全力帮您解决的~
如果您有所不满愿意,请谅解~
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