解:x²-x-1/2=0
(x-1/2)²=3/4
x-1/2=±3√2/2
X1=3√2+1
X2=-3√2+1
哇 累死了 希望是对的
-2x的2次方+2x+1=0
两边同除以(-2)得:
x²-x=1/2
(x-1/2)²=3/4
x-1/2=±√3/2
x=(1±√3)/2
-2x²+2x+1=0
2x²-2x-1=0
2(x-1/2)²=3/2
x-1/2=±根号下3/2
x=1/2±根号下3/2
(1±√3)/2