2运输问题的基变量总数是m+n-1 写出增广矩阵 xI X 112 X:X x n521“22 x x…1,x x A b2.运输问题的基变量总数是m + n -1 写出增广矩阵                                 = n m b b b a a a A 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 2 1                 n n m m mn x , x ,  , x ; x , x , x ,  ,  ,  ,  , x , x , x 1 1 1 2 1 2 1 2 2 2 1 2