方法1：
from numpy import * import numpy as np A=np.array([[1,2],[3,4]]) B=np.linalg.inv(A) print(B) print(np.dot(B,A))
方法2：
from numpy import * a1 = mat([[1, 2], [3, 4]]) a2 = a1.I print(a2) print(a2*a1)
方法1：
from numpy import * import numpy as np A=np.array([[1,2],[3,4]]) B=np.linalg.inv(A) print(B) print(np.dot(B,A))
方法2：
from numpy import * a1 = mat([[1, 2], [3, 4]]) a2 = a1.I print(a2) print(a2*a1)
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