数学建模例题2.35 求线性方程组

`import numpy as np
a = np.array([[3, 1], [1, 2], [1, 1]])
b = np.array([9, 8, 6])
x = np.linalg.pinv(a) @ b
print(np.round(x, 4))

print("学号：3005")`