Python编程实战：求取一元二次方程的根

import math

a = float(input("请输入a的值："))

b = float(input("请输入b的值："))

c = float(input("请输入c的值："))

if a != 0:

    delta = b**2-4*a*c

    if delta < 0:

        print("无根")

    elif delta == 0:

        s = -b/(2*a)

        print("唯一根x=",s)

    else :

        root = math.sqrt(delta)

        x1 = (-b+root)/(2*a)

        x2 = (-b-root)/(2*a)

        print("x1=",x1,"\t","x2=",x2)