已知-m²+2m=4n,-n²+2n=4m,求m/n的值
问题描述:
已知-m²+2m=4n,-n²+2n=4m,求m/n的值
急.
答
答:
-m²+2m=4n
-n²+2n=4m
两式相减:
m²-n²+2n-2m=4m-4n
(m-n)(m+n)-6(m-n)=0
(m-n)(m+n-6)=0
所以:
m-n=0或者m+n=6
解得:m=n或者n=6-m
代入原式有:
m²-2m+4(6-m)=0,m²-6m+24=0,无实数解
综上所述,m=n
所以:m/n=1