If p(x) = A3 x2 + A2 x + A1 
and 
q(x) = B3 x2 + B2 x + B1 

结果是： r(x) = p(x) * q(x) 

输出是： 

( (A1 * B1), (A2 * B1) + (A2 * B1),
(A3 * B1) + (A2 * B2) + (A1 * B3), 
(A2 * B2) + (A3 * B2), (A3 * B3) ).

numpy.polymul(p1, p2)

# importing package
import numpy
  
# define the polynomials
# p(x) = 5(x**2) + (-2)x +5
  
px = (5, -2, 5)
# q(x) = 2(x**2) + (-5)x +2
qx = (2, -5, 2)
  
# mul the polynomials
rx = numpy.polynomial.polynomial.polymul(px, qx)
  
# print the resultant polynomial
print(rx)

[ 10. -29.  30. -29.  10.] 

# importing package
import numpy
  
# define the polynomials
# p(x) = 2.2
px = (0, 0, 2.2)
  
# q(x) = 9.8(x**2) + 4
qx = (9.8, 0, 4)
  
# mul the polynomials
rx = numpy.polynomial.polynomial.polymul(px, qx)
  
# print the resultant polynomial
print(rx)

[  0.     0.    21.56   0.     8.8 ]

# importing package
import numpy
  
# define the polynomials
# p(x) = (5/3)x
px = (0, 5/3, 0)
  
# q(x) = (-7/4)(x**2) + (9/5)
qx = (-7/4, 0, 9/5)
  
# mul the polynomials
rx = numpy.polynomial.polynomial.polymul(px, qx)
  
# print the resultant polynomial
print(rx)

[ 0.         -2.91666667  0.          3.        ]