n.情妇，主妇m________
举一反三
- n.女主人;主妇;情妇,情人 A: mistress B: boss C: certificate D: resolve
- Both m and n are therefore even, to our choice of m and n.
- 设A为m×n矩阵，B为n×m矩阵，若AB＝E，则( ) A: r(A)＝m，r(B)＝m． B: r(A)＝m，r(B)＝n． C: r(A)＝n，r(B)＝m． D: r(A)＝n，r(B)＝n．
- 已知m,n均为正整数.且m^2-n^2=68,求m,n.
- 设A为秩是r的m×n矩阵，非齐次线性方程组Ax=b有解的充分条件是 A: r=m． B: m=n． C: r=n． D: m＜n．