xRPAbs - Online Python3 Interpreter & Debugging Tool

import math

def quadratic(a, b, c):
	x1=-b+math.sqrt(b**2-4*a*c)/2*a
	x2=-b-math.sqrt(b**2-4*a*c)/2*a
	return x1,x2

# 测试:
print('quadratic(2, 3, 1) =', quadratic(2, 3, 1))
print('quadratic(1, 3, -4) =', quadratic(1, 3, -4))

if quadratic(2, 3, 1) != (-0.5, -1.0):
    print('测试失败')
elif quadratic(1, 3, -4) != (1.0, -4.0):
    print('测试失败')
else:
    print('测试成功')