x²-5x/2-3/2=0
x²-5x/2+(5/4)²=3/2+(5/4)²
(x-5/4)²=49/16
x-5/4=7/4 或x-5/4=-7/4
得x=3或x=-1/2好吧 我算出来也是这样 谢谢哦！