求方程组 (x+5)×(y-5)=xy (x+10)×(y-9)=xy
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求方程组 (x+5)×(y-5)=xy (x+10)×(y-9)=xy
x=40 y=45.
x=40 y=45.
![求方程组 (x+5)×(y-5)=xy (x+10)×(y-9)=xy](/uploads/image/z/17891111-47-1.jpg?t=%E6%B1%82%E6%96%B9%E7%A8%8B%E7%BB%84+%EF%BC%88x%2B5%EF%BC%89%C3%97%EF%BC%88y-5%EF%BC%89%3Dxy+%EF%BC%88x%2B10%EF%BC%89%C3%97%EF%BC%88y-9%EF%BC%89%3Dxy)
(x+5)×(y-5)=xy (x+10)×(y-9)=xy (x+5)×(y-5)=(x+10)×(y-9) 5y-5x-25=10y-9x-90 5y=4x+65 y=(4x+65)/5 代入(x+5)×(y-5)=xy 5X=200 X=40 Y=(4*40+65)/5=45
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