2x^2-5x+3=0
2(x²-5x/2)+3=0
2(x-5/4)²+3-25/8=0
2(x-5/4)²=1/8
(x-5/4)²=1/16
x-5/4=±1/4
x=1或x=3/2
十字相乘法
2x^2-5x+3=0
(2x-3)(x-1)=0
x=1或x=3/2