A.\(8\)
B.\(9\)
C.\(1\)
D.Vô số

A.11
B.14
C.5
D.13

A.\(y = \dfrac{{x + 1}}{{x-2}}.\)
B.\(y = {x^2} + 2x\).
C.\(y = {x^3}-{x^2} + x\)
D.\(y = {x^4}-3{x^2} + 2\).

A.\(\dfrac{7}{8}\).  
B.\(\dfrac{8}{{15}}\)
C.\(\dfrac{7}{{15}}\)  
D.\(\dfrac{1}{2}\).

A.\(\overrightarrow {{u_1}}  = \left( {1;1;1} \right).\)  
B.\(\overrightarrow {{u_2}}  = \left( {1;2;1} \right).\)
C.\(\overrightarrow {{u_3}}  = \left( {0;1;0} \right).\)  
D.\(\overrightarrow {{u_4}}  = \left( {1; - 2;1} \right).\)

A.\(\;\left( {{P_1}} \right):\,x + y + z = 0\) 
B.\(\left( {{P_2}} \right):\,x + y + z--1 = 0.\)
C.\(\left( {{P_3}} \right):\,x--2y + z = 0.\) 
D.\(\left( {{P_4}} \right):\,x + 2y + z--1 = 0.\)

A.9
B.3
C.81
D.6

A.\(\left( {4;2;2} \right)\)
B.\(\left( {2;1;1} \right)\)
C.\(\left( {2;0; - 2} \right)\)
D.\(\left( {1;0; - 1} \right)\)

A.\(12\pi \;c{m^2}\)
B.\(48\pi \;c{m^2}\)
C.\(24\pi \;c{m^2}\)
D.\(36\pi \;c{m^2}\)

A.\(V = \pi rh\)
B.\(V = \pi {r^2}h\)
C.\(V = \dfrac{1}{3}\pi rh\)
D.\(V = \dfrac{1}{3}\pi {r^2}h\)