2X^2+1=3X
2X^2-3X+1=0
X^2-3/2X+1/2=0
X^2-3/2X=-1/2
X^2-3/2X+9/16=-1/2+9/16
(X-3/4)^2=1/16
X-3/4=正负1/4
X1=1
X2=1/2
X^2就是X的平方 我打不出来