定义一个函数计算两个2*2 矩阵更多乘法，乘法规则如图所示。输入两个矩阵，输出其乘法结果。示例运行结果如下。

以下是 Python 代码实现：

def matrix_multiply(a, b):
    c = [[0, 0], [0, 0]]
    for i in range(2):
        for j in range(2):
            for k in range(2):
                c[i][j] += a[i][k] * b[k][j]
    return c

a = [[1, 2], [3, 4]]
b = [[5, 6], [7, 8]]
c = matrix_multiply(a, b)

print("矩阵 A：")
for i in range(2):
    print(a[i])
print("矩阵 B：")
for i in range(2):
    print(b[i])
print("矩阵 C = A × B：")
for i in range(2):
    print(c[i])

输出结果为：

矩阵 A：
[1, 2]
[3, 4]
矩阵 B：
[5, 6]
[7, 8]
矩阵 C = A × B：
[19, 22]
[43, 50]