A.\( - 1 < m \le 1\)
B.\(\left[ {\begin{array}{*{20}{c}}{m > 1}\\{m <  - 1}\end{array}} \right.\)
C.\(\left[ {\begin{array}{*{20}{c}}{m = 1}\\{m = 3}\end{array}} \right.\)
D.\(m \ge 1\)

A.\(5\)
B.\(4\)
C.\(3\)
D.\(2\)

A.\(42\)
B.\(14\)
C.\(18\)
D.\(21\)

A.\(7\)
B.\(5\)
C.Vô số
D.\(6\)

A.\(301\)
B.\(302\)
C.\(602\)
D.\(2\)

A.\(\dfrac{{3\sqrt 3 a}}{4}\)
B.\(\dfrac{{\sqrt 3 a}}{4}\)
C.\(\dfrac{{\sqrt 3 a}}{2}\)
D.\(\dfrac{{\sqrt 3 a}}{3}\)

A.\(4\)
B.\(3\)  
C.\(2\)
D.\(1\)

A.\(m \ge 2\)
B.\(m < 2\)
C.\(m \le 2\)
D.\(m > 2\)

A.\(24\sqrt 3 {a^3}\)
B.\(16\sqrt 3 {a^3}\)
C.\(4\sqrt 3 {a^3}\)
D.\(48\sqrt 3 {a^3}\)

A.\(T = {\log _3}2\)
B.\(T = 5\)
C.\(T = {\log _2}6\)
D.\(T = 1\)