求助...555急急..万分感谢.英文数学题
问题描述：
求助...555急急..万分感谢.英文数学题
if matrix A has dimensions m*n and matrix B has dimensions n*p,where m,n,and p are distinct positive integers,which of the following statements must be true?
1,the product BA does not exist
2,the product AB exists and has dimensions m*p
3,the product AB exists and has dimensions n*n
答
如果矩阵A的尺寸是m*n和矩阵B的尺寸是n*p,其中m,n和p是不同的正整数,那么下面哪句话是真实的?
1.BA不存在
2.AB存在,且尺寸为m*p
3.AB存在,且尺寸为n*n
选2
请问是不懂英语还是不懂数学啊?