1/4x²-6x+3=0
1/4x²-6x=-3 方程两边同时乘4
x²-24x=-12
x²-24x+144=-12+144
(x-12)²=132
x-12=±√132
x-12=±2√33
x=12±2√33
x1=12+2√33
x2=12-2√33
2x²-4x+1=0
2x²-4x=-1 方程两边同时除以2
x²-2x=-1/2
x²-2x+1=-1/2+1
(x-1)²=1/2
x-1=±√(1/2)
x-1=±√2/2
x=1±√2/2=(2±√2)/2
x1=(2+√2)/2
x2=(2-√2)/2