(10X+10Y)÷(X-Y)=40 X,Y各等于几,
问题描述:
(10X+10Y)÷(X-Y)=40 X,Y各等于几,
答
(10X+10Y)÷(X-Y)=40
(10X+10Y)=40(X-Y)
(X+Y)=4(X-Y)
x+y=4x-4y
3x=5y
x/y=5/3