怎么用python解一元二次方程？import numpy as npdef solve_quad(a，b，c):if a == 0:print("您輸入的不是二次方程!")else:delta =

怎么用python解一元二次方程？

import numpy as np

def solve_quad(a，b，c):

if a == 0:

print("您輸入的不是二次方程!")

else:

delta = b*b-4*a*c

x = -b/(2*a)

if delta == 0:

print("方程有惟一解，X=%f"%(x))

return x

elif delta > 0:

x1 = x-np.sqrt(delta)/(2*a)

x2 = x np.sqrt(delta)/(2*a)

print("方程有兩個(gè)實(shí)根:X1=%f，X2=%f"%(x1，x2))

return x1，x2

else:

x1 = (-b complex(0，1)*np.sqrt((-1)*delta))/(2*a)

x2 = (-b-complex(0，1)*np.sqrt((-1)*delta))/(2*a)

print("方程有兩個(gè)虛根，如下所示：")

print(x1，x2)

return x1，x2