解由x-1/2=x^2-1/4移项得x^2-x+1/2-1/4=0即x^2-x+1/4=0即(x-1/2)^2=0解得x1=x2=1/2.
x-1/2=x ²-1/4x ²-x +1/4=0(x-1/2) ²=0x=1 /2
