A.\(I = \dfrac{1}{2}\)
B.\(I = 0\)
C.\(I = -2\)
D.\(I = 2\)

A.\(\left\{ \begin{array}{l}x = 1 + 3t\\y = 3t\\z = 1 - t\end{array} \right.\).
B.\(\left\{ \begin{array}{l}x = 1 + t\\y = 3t\\z = 1 - t\end{array} \right.\).
C.\(\left\{ \begin{array}{l}x = 1 + t\\y = 1 + 3t\\z = 1 - t\end{array} \right.\)
D.\(\left\{ \begin{array}{l}x = 1 + 3t\\y = 3t\\z = 1 + t\end{array} \right.\)

A.\(3x - 2y + z + 12 = 0\) 
B.\(3x + 2y + z - 8 = 0\)
C.\(3x - 2y + z - 12 = 0\) 
D.\(x - 2y + 3z + 3 = 0\)

A.4 mặt phẳng.  
B.3 mặt phẳng.  
C.6 mặt phẳng.
D.9 mặt phẳng.

A.\(S = ( - \infty ;2] \cup {\rm{[}}16; + \infty )\).
B.\(S = {\rm{[}}2;16]\)
C.\(S = (0;2] \cup {\rm{[}}16; + \infty )\). 
D.\(S = ( - \infty ;1] \cup {\rm{[}}4; + \infty )\).

A.\(D = \mathbb{R}\backslash {\rm{\{ }} - 2\} \) 
B.\(D = ( - \infty ; - 2) \cup {\rm{[}}3; + \infty )\)
C.\(D = ( - 2;3)\). 
D.\(D = ( - \infty ; - 2) \cup (3; + \infty )\)

A.\(P = 9{\log _a}b\).
B.\(P = 27{\log _a}b\).
C.\(P = 15{\log _a}b\)
D.\(P = 6{\log _a}b\)

A.\(V = \pi  - 1\)
B.\(V = (\pi  - 1)\pi \)
C.\(V = (\pi  + 1)\pi \)
D.\(V = \pi  + 1\)

A.\((0; + \infty )\)
B.\(( - 1;1)\)
C.\(( - \infty ; + \infty )\)
D.\(( - \infty ;0)\)

A.2
B.3
C.1
D.0