A.6
B.12
C.3
D.4

A.\(\left( { - 1;0} \right)\)
B.\(\left( { - \infty ;0} \right)\)
C.\(\left( {3; + \infty } \right)\)
D.\(\left( { - \infty ; - 1} \right)\)

A.4
B.0
C.3
D.1

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

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

A.\(1 + {\log _2}a.\)
B.\(2{\log _2}a\)
C.\(2 + {\log _2}a\)
D.\(1 - {\log _2}a\)

A.\(4\pi \)
B.\(\dfrac{{4\pi }}{3}\)
C.\(\dfrac{\pi }{3}\)
D.\(\dfrac{{32\pi }}{3}\)

A.6
B.0
C.8
D.4

A.\({T_1} = 0,85s;{\rm{ }}{T_2} = 0,98s;{\rm{ }}{T_3} = 1,52s\)
B.\({T_1} = 0,98s;{\rm{ }}{T_2} = 1,52s;{\rm{ }}{T_3} = 0,85s\)
C.\({T_1} = 1,525s;{\rm{ }}{T_2} = 0,85s;{\rm{ }}{T_3} = 0,98s\)
D.\({T_1} = 1,525s;{\rm{ }}{T_2} = 0,98s;{\rm{ }}{T_3} = 0,85s\)

A.CaCO3 + 2HCl → CaCl2 + CO2 + H2O.
B.Na2CO3 + 2HNO3 → 2NaNO3 + CO2 + H2O.
C.NaHCO3 + NaHSO4 → Na2SO4 + CO2 + H2O.
D.K2CO3 + 2CH3COOH → 2CH3COOK + CO2 + H2O.