线性方程组 { a 11 x 1 + a 12 x 2 +⋯+ a 1n x n = b 1, a 21 x 1 + a 22 x 2 +⋯+ a 2n x n = b 2, ⋯⋯ ⋯⋯ a m1 x 1 + a m2 x 2 +⋯+ a mn x n = b m }的系数矩阵为 A,增广矩阵为 A ˉ ,则它有无穷多个解的充要条件为 。
单选题
2021-09-01 22:18
A、R(A)=R( A ˉ )<n
B、R(A)=R( A ˉ )<m
C、R(A)<R( A ˉ )<m
D、R(A)=R( A ˉ )=m