Cho hệ phương trình tuyến tính: \[\left\{ \begin{array}{l}9{x_1} + {x_2} + 4{x_3} = 1\\2{x_1} + 2{x_2} + 3{x_3} = 5\\7{x_1} + {x_2} + 6{x_3} = 7\end{array} \right.\]

Tính các định thức D,D1,D2,D3

A. u = (1,−2,1),v = (2,1,−1)

B. u = (2,−3,13),v = (2,0,8),w = (8,−1,8),x = (3,−9,7)

C. u = (1,1,1),v = (1,2,3),w = (2,−1,1)

D. u = (1,1,2),v = (1,2,5),w = (5,3,4)

A. λ=10

B. λ=−11

C. λ=12

D. λ=11

A. u = (1,−2,1),v = (2,1,−1),w = (7,−1,4)

B. u = (1,−3,7),v = (2,0,8),w = (8,−1,8),x(3,−9,7)

C. u = (1,2,−3),v = (1,−3,2),w = (2,−1,5)

D. u = (2,−3,13),v = (0,0,0),w = (1,−10,11)

A. r = 4

B. r = 2

C. r = 3

D. r = 1

A. Các véc tơ có dạng (x,0,z)

B. Các véc tơ có dạng (x, y,1)

C. Các véc tơ có dạng (x,y,z) thoả mãn x + y + z = 0

D. Các véc tơ có dạng (x,y,z), 2x-y+z=0, x+y-4z=0

A. u = (2,1,−3),v = (3,2,−5),w(1,−1,1)

B. u = (2,−1,3),v = (4,1,2),w = (8,−1,8)

C. u = (3,1,4),v = (2,−3,5),w = (5,−2,9),s=(1,4,−1)

D. u = (3,1,13),v = (2,7,4),w = (1,−10,11)

A. \[\left( {\begin{array}{*{20}{c}}\begin{array}{l}1\\5\end{array}&\begin{array}{l}2\\0\end{array}&\begin{array}{l} - 3\\7\end{array}&\begin{array}{l}6\\9\end{array}\end{array}} \right) + \left( {\begin{array}{*{20}{c}}\begin{array}{l} - 5\\ - 2\end{array}&\begin{array}{l}1\\8\end{array}&\begin{array}{l} - 3\\ - 4\end{array}&\begin{array}{l}0\\2\end{array}\end{array}} \right)\]

B. \[\left( {\begin{array}{*{20}{c}}\begin{array}{l}1\\3\end{array}&\begin{array}{l}2\\4\end{array}&\begin{array}{l}5\\7\end{array}\end{array}} \right) + \left( {\begin{array}{*{20}{c}}4&3\\2&9\end{array}} \right)\]

C. \[ - 3\left( {\begin{array}{*{20}{c}}\begin{array}{l}1\\5\end{array}&\begin{array}{l}2\\0\end{array}&\begin{array}{l} - 3\\7\end{array}&\begin{array}{l}6\\9\end{array}\end{array}} \right)\]

D. \[0\left( {\begin{array}{*{20}{c}}\begin{array}{l} - 5\\ - 2\end{array}&\begin{array}{l}1\\8\end{array}&\begin{array}{l} - 3\\ - 4\end{array}&\begin{array}{l}0\\2\end{array}\end{array}} \right)\]