3m²-6m-6=0m²-2m+1=3(m-1)²=3m=1+√3或m=1-√3
3㎡-6m-6=0㎡-2m-2=0(m-1)(m-1)=3m=1-根号3或m=1+根号3
3㎡-6m-6=0㎡-2m-2=0
3㎡-6m-6=0m²-2m-2=0m²-2m+1=3（m-1）²=3m-1=±√3m=1±√3
