A.75% cây hoa đỏ: 25% cây hoa trắng.
B.50% cây hoa đỏ : 50% cây hoa trắng.
C.25% cây hoa đỏ : 75% cây hoa trắng.
D.100% cây hoa đỏ.

A.29
B.52
C.28
D.27

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

A.\(\dfrac{{ - 1}}{2}\)
B.\(\ln 4\)
C.\( - \ln 4\)
D.\(\dfrac{1}{2}\)

A.\(I\left( {2; - 1; - 3} \right),\,\,R = 16\)
B.\(I\left( { - 2;1;3} \right),\,\,R = 16\)
C.\(I\left( {2; - 1; - 3} \right),\,\,R = 4\)
D.\(I\left( { - 2;1;3} \right),\,\,R = 4\)

A.\(\overline z  = 5 - 2i\)
B.\(\overline z  =  - 2 - 5i\)
C.\(\overline z  = 2 + 5i\)
D.\(\overline z  = 2 - 5i\)

A.\(G\left( {0;1; - 1} \right)\)
B.\(G\left( {0; - 2; - 2} \right)\)
C.\(G\left( {0;2; - 2} \right)\)
D.\(G\left( {0;2;2} \right)\)

A.\(\sqrt {445} \)
B.25
C.\(\sqrt {13} \)
D.5

A.\(\int {f\left( x \right)dx}  =  - \cos 2x + C\)
B.\(\int {f\left( x \right)dx}  = \dfrac{1}{2}\cos 2x + C\)
C.\(\int {f\left( x \right)dx}  = \cos 2x + C\)   
D.\(\int {f\left( x \right)dx}  =  - \dfrac{1}{2}\cos 2x + C\)

A.\(\left\{ \begin{array}{l}x = 3 + t\\y =  - 1\\z = 4\end{array} \right.,\,\,t \in \mathbb{R}\)
B.\(\left\{ \begin{array}{l}x = 2\\y =  - 1 + t\\z = 4 + t\end{array} \right.,\,\,t \in \mathbb{R}\)
C.\(\left\{ \begin{array}{l}x = 1 + 2t\\y =  - t\\z = 4t\end{array} \right..,\,\,t \in \mathbb{R}\)
D.\(\left\{ \begin{array}{l}x = 2\\y =  - 1 + t\\z = 4 + t\end{array} \right.,\,\,t \in \mathbb{R}\)