###import math

####def quadratic(a,b,c): δ = b*2 - 4ac if δ > 0: x1 = (-b + math.sqrt(δ)) / (2 a) x2 = (-b - math.sqrt(δ)) / (2 a) return x1, x2 elif δ == 0: x1 = x2 = -b/2a return x1,x2 else: print("该一元二次方程无解") raise

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')

print('求一元二次方程ax^2+bx+c=0的两个根') a = int(input("请输入a的值：")) b = int(input("请输入b的值：")) c = int(input("请输入c的值："))

print(quadratic(a,b,c))