A.\( - \dfrac{1}{2}\sin 2x + C\)
B.\( - \sin 2x + C\)
C.\(\dfrac{1}{2}\sin 2x + C\)
D.\(\sin 2x + C\)

A.\(1\)
B.\(2\)
C.\(4\)
D.\(3\)

A.\(\overrightarrow {{n_1}}  = \left( {2; - 3;0} \right)\)
B.\(\overrightarrow {{n_4}}  = \left( {2;3;5} \right)\)
C.\(\overrightarrow {{n_2}}  = \left( {2; - 3;5} \right)\)
D.\(\overrightarrow {{n_3}}  = \left( { - 2;3;5} \right)\)

A.\(4\)
B.\(3\)
C.\(5\)
D.\(6\)

A.\(4\)
B.\(3\)
C.\(8\)
D.\(12\)

A.\(\dfrac{9}{4}\)
B.\(\dfrac{8}{9}\)
C.\(9\)
D.\(\dfrac{9}{2}\)

A.\(x = \dfrac{{10}}{3}\)
B.\(x = \dfrac{7}{3}\)
C.\(x = 3\)
D.\(x = 6\)

A.0,l s.
B.0,4s.
C.0,2s.
D.0,8s.

A.NO2.
B.NO.
C.CO2.
D.CO.

A.FeO.
B.Fe2O3.
C.FeO hoặc Fe2O3.
D.Fe3O4.