求方程组 (x+5)×(y-5)=xy (x+10)×(y-9)=xy
问题描述:
求方程组 (x+5)×(y-5)=xy (x+10)×(y-9)=xy
x=40 y=45.
答
(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