gaus1

import numpy as np
A = np.array([[2.69, 2.47, 2.07],
    [2.73, 2.39, 1.92],
    [2.93, 2.52, 2.02]])
b = np.array([[19.37], [19.43], [20.8]])

def Gaus(A, b):
    n = A.shape[0]
    for i in range(n):
        b[i] /= A[i][i]
        A[i] /= A[i][i]
        for j in range(i + 1, n):
            b[j] -= A[j][i] * b[i]
            A[j] -= A[j][i] * A[i]

    for i in range(n - 1, -1, -1):
        for j in range(i - 1, -1, -1):
            b[j] -= b[i] * A[j][i]
    return b
ans = Gaus(A.copy(), b.copy())
print(ans)