m^2-6m+9与|n-1|互为相反数,则(m/n-n/m)/(m/n)为?

题目

m^2-6m+9与|n-1|互为相反数,则(m/n-n/m)/(m/n)为?

答案

（m-3)^2大于等于0,绝对值,也大于等于0
但是两者互为相反数,所以两者都是0,
所以(m-3)^2=0,m=3,n-1的绝对值=0,n=1,
(m/n-n/m)/(m/n)=(3/1-1/3)/(3/1)=8/9