Bài tập 30 trang 215 SGK Toán 12 NC

A. \(y' = x\ln 2020\) .                

B. \(y' = \dfrac{x}{{\ln 2020}}.\)                                    

C. \(y' = \dfrac{1}{x}.\) 

D. \(y' = \dfrac{1}{{x\ln 2020}}.\)

A. \(\dfrac{1}{m} + \dfrac{1}{n}.\)                 

B. \(\dfrac{1}{{m + n}}.\)    

C. \(\dfrac{{m + n}}{{m.n}}\)        

D. \(\dfrac{{mn}}{{m + n}}.\)

A.\(\left( { - \infty ;1} \right)\) và \(\left( {1; + \infty } \right).\)                                     

B. \(\mathbb{R}\backslash \left\{ 1 \right\}.\)                                 

C.\(\mathbb{R}.\)              

D. \(\left( {0; + \infty } \right).\)

A. \(\mathbb{R}\backslash \left\{ 1 \right\}.\)                    

B. \(\left( {1; + \infty } \right).\)      

C. \(\mathbb{R}\backslash \left\{ {0,1} \right\}\)                

D. \(\mathbb{R}\backslash \left\{ 0 \right\}\)

A. \(160.\)                               

B. \(100.\)                          

C.\(200.\)                          

D. \(120.\)

A. \(S =  - 2\ln \left( {\dfrac{a}{{bc}}} \right).\)                    

B. \(S = 2\ln \left( {\dfrac{a}{{bc}}} \right).\)           

C. \(S = 0.\)       

D. \(S = 1.\)

A. \(\emptyset .\)                    

B.\(\left\{ 2 \right\}.\)        

C. \(\left\{ { - 1} \right\}.\).            

D. \(\left\{ { - 1;2} \right\}.\)

 A.\(3.\)                                   

B. \(4.\).                            

C. \(5.\)                             

D. \(2.\).

A. \(10.\)                          

B. \(7.\)                            

C. \(8.\)                            

D. \(9.\)

A. \(4.\)                            

B. \(2.\)                            

C. \(3.\)                            

D. \(1.\)

A. \(S = \left\{ {0;1} \right\}.\)                                     

B. \(S = \left\{ { - 1;1} \right\}.\)     

C. \(S = \left\{ {0; - 1} \right\}.\)                                

D. \(S = \left\{ {1;\dfrac{1}{3}} \right\}.\)

A. \(3.\)                            

B. \(2.\)                            

C. \(1.\)                            

D. \(4.\)

A. \(3.\)                          

B. \(2.\)                        

C. \(1.\)                   

D. \(0.\)

A. \(\mathbb{R}.\)               

B. \(\mathbb{R}\backslash \left\{ { - 5} \right\}.\)

A. \(\left( {3; + \infty } \right).\)                  

B. \(\left( { - \infty ;3} \right).\)

C. \(\left( {3;6} \right).\)                  

D. \(\left( {0;3} \right).\)

A. \(100.1,{068^4}\)(đồng).

B. \(100.1,{068^5}\)(triệu đồng).

C. \(100.1,{068^3}\)(triệu đồng).

D. \(100.1,{068^4}\)(triệu đồng).

A. 19 000 (đồng).          B. 76 000 (đồng).

C. 38 000 (đồng).          D. 30 000 (đồng).

A. \(\mathbb{R}.\)                       

B. \(\left( {0; + \infty } \right).\)

C. \(\left( { - \infty ;0} \right).\)                        

D. \(\mathbb{R}\backslash \left\{ 0 \right\}.\)