\(A = \left| {6 + 2x} \right| - 7\)
A.\(\min A = 6\)
B.\(\min A = - 6\)
C.\(\min A = - 7\)
D.\(\min A = 7\)

\(A = \left| {6 + 2x} \right| - 7\)
A.\(\min A = 6\)
B.\(\min A = - 6\)
C.\(\min A = - 7\)
D.\(\min A = 7\)

\(C = {\left( {x - 1} \right)^2} + \left| {2 - y} \right| + 3\)
A.\(\min C = 3\)
B.\(\min C = 1\)
C.\(\max C = 3\)
D.\(\min C = 2\)

\(E = 7 - \left| {x + 6} \right| - \left| {8 - 2y} \right|\)
A.\(\max E = 7\)
B.\(\min E = 7\)
C.\(\min E = 2\)
D.\(\max E = 2\)

\(\left| {12 - \left( {x - 13} \right)} \right| < 5\)
A.\(x \in \left\{ {29;28;27;26;24;23;22;21} \right\}\)
B.\(x \in \left\{ {29;28;27;26;25;24;23;22} \right\}\)
C.\(x \in \left\{ {29;28;27;26;25;24;23;22;21} \right\}\)
D.\(x \in \left\{ {29;28;27;26;24;23;22} \right\}\)

\(\left| {3x - 2} \right| + 5 = 9 - x\)
A.\(x = 1\)
B.\(x = - 1\)
C.\(x = 0\)
D.\(x = - 2\)

\({\left( {3x - 1} \right)^4} - {\left( {3x - 1} \right)^6} = 0\)
A.\(x = 1\)
B.\(x = - 1\)
C.\(x = 0\)
D.\(x = 2\)

\({x^3} - 9x \le 0\)
A.\(x\) là các số nguyên âm.
B.\(x \in \left\{ {2;3;4;...} \right\}\)
C.\(x \in \left\{ {....; - 5; - 4; - 3} \right\}\)
D.\(x \in \left\{ {....; - 5; - 4; - 3} \right\}\) và \(x \in \left\{ {0;\,\,1;\,\,2;\,\,3} \right\}.\)

Tìm giá trị nhỏ nhất của biểu thức \(A = {x^2} - 2x + {y^2} + 4y + 3\)
A.\(-2\)
B.\(3\)
C.\(-1\)
D.\(1\)

\(2 - 5 + 8 - 11 + 14 - 17 + \ldots + 98 - 101 + 104 - 107\)
A.\(-36\)
B.\(-54\)
C.\(-38\)
D.\(-40\)