题目有没有搞错?要是:m+1/m=3,则m^2+(1/m)^2=(m+1/m)^2-2=3^2-2=7
m^2+1/m=3 m^2=3-1/m m^2+(1/m)^2=3-1/m+3-m=6-m-1/m6-(m+1/m)
6
