如果x/x-y=m/n,求x/y的值

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如果x/x-y=m/n,求x/y的值
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如果x/x-y=m/n,求x/y的值
如果x/x-y=m/n,求x/y的值

如果x/x-y=m/n,求x/y的值
x/x-y=m/n
所以
xn=m(x-y)
nx=mx-my
my=(m-n)x
x/y=m/(m-n)

x/x-y=m/n
则:两边倒数得:
(x-y)/x=n/m
1-(y/x)=n/m
y/x=1-(n/m)
y/x=(m-n)/m
两边取倒数得:
x/y=m/(m-n)

(x-y+y)/(x-y)=1+y/(x+y)=1+ 1/(x/y +1 )=m/n
1/(x/y +1 )=m-n /n
x/y=(2n-m)/m-n