【简答题】When my father bought me a computer as a birthday gift for me in last year, I felt very excited. As we all know, computers are getting more and more usefully now. Much information can be stored in the...
【简答题】设α ij (i,j=1,2,…,n)为一组数,满足 ∑ i,j=1 n |α ij -δ ij |<1, 其中 那么线性方程组 Ax=b 有惟一的解,其中矩阵A=(α ij ) x=(x 1 ,x 2 ,…,x n ) T 为待定系数,b=(b 1 ,b 2 ,…,b n ) T 是给定的。