# -*- coding: utf-8 -*-
import math

def quadratic(a, b, c):
    x1=0
    x2=0
    if not isinstance(a,(int,float)) or not isinstance(a,(int,float)) or not isinstance(a,(int,float)):
        raise TypeError('bad operand type')
    if a == 0:
        print('分母a不能为0！')
    elif ((b*b-4*a*c)<0):
        print('负数无法开平方！,方程无解')
    else:
        x1=(-b+math.sqrt(b*b-4*a*c))/2*a
        x2=(-b-math.sqrt(b*b-4*a*c))/2*a
        print('方程解1为：',x1)
        print('方程解2为：',x2)
quadratic(1,1,1)