2x^2-3x+1/2=0x²-3x/2=-1/4x²-3x/2+9/16=-1/4+9/16(x-3/4)²=5/16x-3/4=±√5/4x=(3±√5)/4
2（x^2-3/2x） 1/2=0, 2（x-3/4）^2=2×（3/4）^2-1/2=5/8, (x -3/4)^2=5/16, x -3/4=±√5/4, x =3/4±√5/4
