Strassn关于两个矩阵相乘的算法，同过分治原理把两个n*n的矩阵阶各分解成四个n/2*n/2阶的矩阵，当分解出来的矩阵阶数等于2时，求借各个小矩阵，若阶数大与2，就递归的调用前面方法，直到分解成2*2的子矩阵为止。-Strassn on two matrix multiplication, the algorithm, with the governing principle over two n * n matrix of the band decomposed into 4 n / 2