4㎡－3m－1＝0
(4m+1)(m-1)=0
m=-1/4或m=1用配方法4m²-3m-1=0(2m)²-3m=1(2m)²-3m+(3/4)²=1+(3/4)²(2m-3/4)²=25/162m-3/4=±5/42m-3/4=5/4m=1或2m-3/4=-5/4m=-1/4即：方程的解为m=-1/4或m=1