Bài tập 6 trang 216 SBT Toán 12

A. \(\dfrac{8}{3}\)        

B. \(\dfrac{7}{3}\)  

C. \(\dfrac{7}{2}\)        

D. 4  

A. \(D = \mathbb{R}\backslash \left\{ { - 2} \right\}\)

B. \({\rm{D}} = \left( { - 2;3} \right)\)

C. \(D = \left( { - \infty ;2} \right) \cup \left[ {3; + \infty } \right)\)

D. \({\rm{D}} = \left( { - \infty ;2} \right) \cup \left( {3; + \infty } \right)\)

A. \( - \dfrac{{23}}{{27}}\)    

B. \(1\)     

C. \( - 2\)     

D. \( - \dfrac{{32}}{{27}}\)  

A. \(x < \dfrac{3}{5}\)  

B. \(x > \dfrac{5}{3}\) 

C. \(x > \dfrac{3}{5}\) 

D. \(x < \dfrac{5}{3}\)

A. \(f'\left( x \right) = \dfrac{{2x}}{{{x^2} + 1}}\)               

B. \(f'\left( x \right) =  - \dfrac{{2x}}{{\left( {{x^2} + 1} \right)\log e}}\)

C. \(f'\left( x \right) = \dfrac{1}{{\left( {{x^2} + 1} \right)\ln 10}}\)                  

D. \(f'\left( x \right) = \dfrac{{2x}}{{\left( {{x^2} + 1} \right)\ln 10}}\)   

A. \({y_{C{\rm{D}}}} = 3\)     

B. \({y_{C{\rm{D}}}} =  - 1\)   

C. \({y_{C{\rm{D}}}} =  - 6\)   

D. \({y_{C{\rm{D}}}} = 8\)  

A. \(x = 1\)         

B. \(y = 1\) 

C. \(y =  - 1\)       

D. \(x =  - 1\)

A. \(\dfrac{{17}}{{12}}\)                 

B. \(\dfrac{1}{8}\)      

C. \(\dfrac{4}{3}\)                  

D. \(\dfrac{3}{4}\)    

A. \(x =  - 7\)       

B. \(x = 5\)  

C. \(x = 3\)           

D. \(x =  - 5\)  

A. \(I\left( {2;2} \right)\)        

B. \(I\left( {1;1} \right)\)         

C. \(I\left( {2;1} \right)\)         

D. \(I\left( {1; - 1} \right)\)   

A. \(D = \left( { - \infty};2 \right)\)   

B. \({\rm{D}} = \left( {2; + \infty } \right)\)  

C. \(D = \mathbb{R}\backslash \left\{ 2 \right\}\)       

D. \({\rm{D}} = \left( { - \infty ;2} \right]\)  

A. \(r = \sqrt[3]{{12}}\)(cm)       

B. \(r = 2\)(cm)

C. \(r = \sqrt {12} \)(cm)         

D. \(r = 3\)(cm) 

A. \(\dfrac{1}{3}{R^2}h\)   

B. \(\dfrac{\pi }{3}{R^2}h\)    

C. \(\dfrac{4}{3}\pi {R^3}h\)   

D. \(\dfrac{4}{3}\pi {R^2}h\)  

A. \(6{{\rm{a}}^3}\)      

B. \(18{{\rm{a}}^3}\)     

B. \(9{{\rm{a}}^3}\)      

D. \(3{{\rm{a}}^3}\)  

A. \({P_{\min }} = \sqrt {34} \)

B. \({P_{\min }} = \sqrt {17} \)

C. \({P_{\min }} = \frac{{\sqrt {34} }}{2}\)

D. \({P_{\min }} = \frac{{13}}{{\sqrt {17} }}\)

A. \(\sqrt 3 \)                  

B. \(\frac{{\sqrt 3 }}{2}\)

C. 1

D. \(2\sqrt 3 \)

A. \(2 < a < 3\)

B. \(0 < a < 2\)

C. \(5 < a < 8\)

D. \(3 < a < 5\)

A. 8

B. 72

C. -72

D. 9