#範例3-9：numpy用反矩陣解聯立方程式
import numpy as np
A = np.array([
    [3, 2,-1],
    [1, 6,3],
    [2, -4,0]
])
A_inv = np.linalg.inv(A)
B = Matrix([
    [3],
    [5],
    [6]
])

print('求解=', A_inv @ B)