y除以X加X除以Y等于2,则X-Y的值为
问题描述:
y除以X加X除以Y等于2,则X-Y的值为
答
y/x+x/y=2
(y^2+x^2)/(xy)=2
x^2+y^2=2xy
(x-y)^2=0
x-y=0
答
y/x+x/y=2
(y^2+x^2)/xy=2
x^2+y^2=2xy
x^2-2xy+y^2=0
(x-y)^2=0
x-y=0