M=5;n=0 cho hệ các vector
U={(1,2,n);(0,-1,1-n);(2,3,n+1);(1, 0,2-n)}.
a. Tìm số chiều và một cơ sở W của không gian con sinh bởi hệ vector U.
b. Tìm tham số k để u=(2,3,k^2 +1) là một tổ hợp tuyến tính của W ,và suy ra [u]n

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