#!usr/bin/env python3

#-- coding:UTF-8 --

import math

a = float(input('请输入参数：a=')) b = float(input('请输入参数：b=')) c = float(input('请输入参数：c='))

def quadratic(a, b, c): s = bb - 4ac if s < 0: return elif s == 0: return -b/2/a,-b/2/a else: return (-b+math.sqrt(s))/(2a),(-b-math.sqrt(s))/(2*a)

if quadratic(a, b, c)== None: print('该方程无解') else: print('ax2 + bx + c = 0的计算结果为：','X1=',quadratic(a, b, c)[0],'X2=',quadratic(a, b, c)[1])