A.
B.
C.
D.

A.\(x + y - z + 2 = 0\)
B.\(x - y + z + 2 = 0\)
C.\(x + y + z - 2 = 0\)
D.\(x - y + z - 2 = 0\)

A.\(2\)
B.\(6\)
C.5
D.\(3\)

A.\(S = \left\{ { - 2 + i;2 - i} \right\}\)
B.\(S = \left\{ { - 2 + i; - 2 - i} \right\}\)
C.\(S = \left\{ {2 + i;2 - i} \right\}\)
D.\(S = \left\{ {2 + i; - 2 - i} \right\}\)

A.\(9\)
B.\( - 9\)
C.\(6\)
D.\( - 6\)

A.\(\int {f'\left( x \right)dx}  = f\left( x \right) + C\)
B.\(\int {f'\left( x \right)dx}  = f'\left( x \right) + C\)
C.\(\int {f'\left( x \right)dx}  =  - f\left( x \right) + C\)
D.\(\int {f'\left( x \right)dx}  =  - f'\left( x \right) + C\)

A.\(z = 2 + 3i\)
B.\(z = 2 - 3i\)
C.\(z =  - 3 + 2i\)
D.\(z =  - 3 - 2i\)

A.\(3\)
B.\( - 2\)
C.\(7\)
D.\( - 1\)

A.\(\mathop \smallint \limits_0^\pi  {\sin ^2}xdx\)
B.\(\pi \mathop \smallint \limits_0^\pi  \sin xdx\)
C.\(\mathop \smallint \limits_0^\pi  \left| {\sin x} \right|dx\)
D.\( - \mathop \smallint \limits_0^\pi  \sin xdx\)

A.sông Đồng Nai
B.sông Mê Kông
C.sông Hồng
D.sông Mã.