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.R
B.\[\left( { - \infty ;1} \right)\]
c. \[\left( {1; + \infty } \right)\]
D. \[\emptyset \]
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.(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.6
C.4
D.5
A.Vô số
B.0
C.9
D.1
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. \[\left[ {0;2} \right]\]
C. \[\left[ {2; + \infty } \right)\]
D. \[\left[ {2; + \infty } \right) \cup \left\{ 0 \right\}\]
A.\[\left( {0; + \infty } \right)\]
B. \[\left( { - \infty ;0} \right)\]
C. \[\left( { - \infty ; - 1} \right)\]
D. \[\left( {0;1} \right)\]
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.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
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