(m-n)²-3m(m-n)=0
(m-n)(m-n-3m)=0
(m-n)(-n-2m)=0
(m-n)(n+2m)=0
m=m或n=-2m
所以m/n=1或m/n=-1/2
（m-n）2-3m（m-n）＝0,则m\n=?
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