m2-5m-1=0 m2-5m=1 两边除以m m-5-1/m=0 m-1/m=5 2m2-5m+1/m2 =m2-5m+m2+1/m2 =1+(m-1/m)2+2 =3+25 =28
2m^2+m-1/2=0
m^2+1/2m-1/4=0
m^2+1/2+(1/4)^2-(1/4)^2=1/4
( m+1/4)^2=1/4+1/16
(m+1/4)^2=5/16
m+1/4=±√5/4
m1=-1+√5/4
m2=-1-√5/4
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