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] W .

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

Bo is buying a board game that usually costs bb dollars. the game is on sale, and the price has been reduced by 18\%18%. what could you find the answer?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.