计算n阶矩阵的逆矩阵的函数，输入表示矩阵的指针和阶数，然后计算输出逆矩阵的指针，附带矩阵乘法检测结果-Calculation of n-order matrix inverse matrix function, enter the matrix express the pointer and order, and then calculating the inverse matrix of output indicators, with matrix multiplication test results