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A.\[f\left( x \right) > 9 \Leftrightarrow x - 2 - \left( {{x^2} - 4} \right){\log _3}7 > 0\]

B. \[f\left( x \right) > 9 \Leftrightarrow \left( {x - 2} \right)\ln 3 - \left( {{x^2} - 4} \right)\ln 7 > 0\]

C. \[f\left( x \right) > 9{\rm{\;}} \Leftrightarrow \left( {x - 2} \right)\log 3 - \left( {{x^2} - 4} \right)\log 7 > 0\]

D. \[f\left( x \right) > 9 \Leftrightarrow \left( {x - 2} \right){\log _{0,2}}3 - \left( {{x^2} - 4} \right){\log _{0,2}}7 > 0\]

A.\[S = \left( {1; + \infty } \right).\]

B. \[S = \left( { - 1; + \infty } \right).\]

C. \[S = \left( { - 2; + \infty } \right).\]

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

A.R

B.\[\left( { - \infty ;1} \right)\]

c. \[\left( {1; + \infty } \right)\]

D. \[\emptyset \]

A.(2;3)                                   

B.(1;2)                            

C.{3}                        

D.\[\left\{ {\frac{1}{3}} \right\}\]

A.\[x < - \ln 2\] hoặc\[x > \ln 2\]

B. \[ - \ln 2 < x < \ln 2\]

C.\(x < \frac{1}{2}\) hoặc x>2

D.\(\frac{1}{2} < x < 2\)

A.\[\left[ {1; + \infty } \right)\]

B. \[( - \infty ;1]\]

C. \[\left( { - \infty ;\frac{{10}}{3}} \right)\]

D. \[\left( {\frac{{10}}{3}; + \infty } \right)\]

A.\[\left( { - \infty ; - 1} \right]\]

B. \[\left[ { - 1; + \infty } \right)\]

C. \[\left( { - \infty ; - 1} \right)\]

D. \[\left( { - 1; + \infty } \right)\]

A.\[(0, + \infty )\]

B. \[( - \infty , + \infty )\]

C. \[(2, + \infty )\]

D. \[( - \infty ,0)\]

A.\[\left[ { - 2;1} \right]\]

B. \[\left( {2;5} \right)\]

C. \[\left[ { - 1;3} \right]\]

D. \[\left( { - \infty ;1} \right) \cup \left( {3; + \infty } \right)\]

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

B. \[\left( { - \infty ; - 1} \right)\]

C. \[\left( {2; + \infty } \right)\]

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

A.Vô số

B.0

C.9

D.1

A.Vô số

B.6

C.4

D.5

A.\[f\left( x \right) > 1 \Leftrightarrow {\log _9}5 + {x^2} > 0\]

B. \[f\left( x \right) > 1 \Leftrightarrow x.\ln 5 + {x^3}\ln 9 > 0\]

C. \[f\left( x \right) > 1 \Leftrightarrow x{\log _9}5 + {x^3} > 0\]

D. \[f\left( x \right) > 1 \Leftrightarrow x + {x^3}{\log _5}9 > 0\]

A.\[\left( {0; + \infty } \right)\]

B. \[\left( { - \infty ;0} \right)\]

C. \[\left( { - \infty ; - 1} \right)\]

D. \[\left( {0;1} \right)\]

A.\[\left( {0; + \infty } \right)\]

B. \[\left[ {0;2} \right]\]

C. \[\left[ {2; + \infty } \right)\]

D. \[\left[ {2; + \infty } \right) \cup \left\{ 0 \right\}\]

A.\[m \ge f\left( 1 \right) - e\]

B. \[m > f\left( { - 1} \right) - \frac{1}{e}\]

C. \[m \ge f\left( { - 1} \right) - \frac{1}{e}\]

d. \[m > f\left( 1 \right) - e\]

A.1

B.2

C.0

D.3

A.65021

B.65024

C.65022

D.65023

A.8999

B.2019       

C.1010       

D.7979

A.\[\min P = \frac{{13}}{2}.\]

B. \[\min P = \frac{9}{2}.\]

C. \[\min P = - 2.\]

D. \[\min P = 6.\]

A.2

B.vô số

C.1

D.0