A.\(y = \dfrac{{2x + 2}}{{1 - 2x}}\)
B.\(y = \dfrac{{2x + 2}}{{x - 1}}\)
C.\(y = \dfrac{{x - 2}}{{1 - x}}\)
D.\(y = \dfrac{{x + 3}}{{x - 1}}\)

A.\(y = {x^3} + 2{x^2} - 2x - 1\)
B.\(y =  - {x^3} - 2{x^2} + x - 1\)
C.\(y = {x^3} + 3{x^2} + 3x + 1\)
D.\(y =  - {x^3} + 3x + 1\)

A.\(\left\{ {1; - 4} \right\}\)                               
B.\(\left\{ { - 1;4} \right\}\)
C.\(\left\{ 4 \right\}\)                                
D.\(\left\{ {\dfrac{{3 - 2\sqrt 2 }}{2};\dfrac{{3 + 2\sqrt 2 }}{2}} \right\}\)

A.\(2\pi r\left( {h + r} \right)\)
B.\(2\pi rh + \pi {r^2}\)
C.\(\dfrac{1}{3}\pi {r^2}h\)
D.\(\pi {r^2}h + 2\pi {r^2}\)

A.1
B.2
C.4
D.3

A.1
B.2
C.3
D.4

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

A.\(\forall x \ne \dfrac{1}{2}\)
B.\(\forall x \ge \dfrac{1}{2}\)
C.\(\forall x \in \left( {\dfrac{1}{2};2} \right)\)
D.\(\forall x > \dfrac{1}{2}\)

A.\(9\pi \,\,c{m^3}\)
B.\(36\pi \,\,c{m^2}\)
C.\(9\pi \,\,c{m^2}\)
D.\(36\pi \,\,c{m^3}\)

A.Hình 2.
B.Hình 4
C.Hình 1
D.Hình 3.