追敢法，主要是n阶线形方程组Ax=b的列主元高斯消去法的一个特殊情况，为上三角矩阵，通用程序如附件所示-Dare to law to recover, mainly n-order linear equations Ax = b of the PCA out Gaussian elimination of a special situation, for the upper triangular matrix, common procedures as indicated in the anne