已知m+m分之1=3,求m的2次方+m的2次方分之1
问题描述：
已知m+m分之1=3,求m的2次方+m的2次方分之1
答
m2+1/m2=(m+1/m)2-2=32-2=7
答
m^2+1/(m^2)
=(m+1/m)^2-2
=3^2-2
=9-2
=7