已知x,y满足等式x=(y-1)/(y+1),则用含x的代数式表示y得急需,快点!!!
问题描述：
已知x,y满足等式x=(y-1)/(y+1),则用含x的代数式表示y得
急需,快点!!!
答
x=(y-1)/(y+1)
解:xy+x=y-1
y-xy=1+x
y(1-x)=1+x
y=1+x/1-x
答
x(y-1)=y+1 xy-x=y+1 xy-y=1+x y(x-1)=1+x y=(1+x)/(x-1)
答
x(y+1)=y-1
xy-y=-x-1
y(x-1)=-x-1
y=(x+1)/(1-x)