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A \({x^2} + {y^2} = 1\).

B \(\frac{{{x^2}}}{8} + \frac{{{y^2}}}{4} = 0\).

C \(\frac{{{x^2}}}{8} + \frac{{{y^2}}}{4} = 1\). 

D \(\frac{{{x^2}}}{4} + \frac{{{y^2}}}{8} = 1\).

A 2

B 4

C \(2\sqrt 3 \).      

D \(4\sqrt 2 \).      

A \(\frac{{{x^2}}}{3} + \frac{{{y^2}}}{2} = 1\).

B \(\frac{{{x^2}}}{9} + \frac{{{y^2}}}{4} = 1\).      

C \(\frac{{{x^2}}}{{36}} + \frac{{{y^2}}}{{16}} = 1\).

D \(\frac{{{x^2}}}{6} + \frac{{{y^2}}}{4} = 1\).

A 1

B 2

C 3

D 6

A \((3;0)\).

B \((0;3)\).           

C \(( - \sqrt 3 ;0)\).

D \((0;\sqrt 3 )\). 

A 6

B 18

C 3

D 9

A \(\frac{8}{{\sqrt 3 }}\)

B \(\frac{4}{{\sqrt 3 }}\)

C \(8\)

D \(4\)

A \(\frac{{{x^2}}}{{16}} - \frac{{{y^2}}}{4} = 1\).  

B \(\frac{{{x^2}}}{{20}} - \frac{{{y^2}}}{5} = 1\).

C \(\frac{{{x^2}}}{{16}} - \frac{{{y^2}}}{9} = 1\).

D \(\frac{{{x^2}}}{{20}} - \frac{{{y^2}}}{{10}} = 1\). 

A \(\frac{{{x^2}}}{6} + \frac{{{y^2}}}{2} = 1\).      

B \(\frac{{{x^2}}}{6} + \frac{{{y^2}}}{3} = 1\). 

C \(\frac{{{x^2}}}{{36}} + \frac{{{y^2}}}{{18}} = 1\).

D \(\frac{{{x^2}}}{{36}} + \frac{{{y^2}}}{{27}} = 1\). 

A \(\frac{{{x^2}}}{5} - \frac{{{y^2}}}{4} = 1\).

B \({x^2} - {y^2} = 9\).     

C \({x^2} - {y^2} = 1\).    

D Không có. 

A \(y = \frac{6}{9}x\).      

B \(y = \frac{9}{6}x\).      

C \(y = \frac{{\sqrt 6 }}{3}x\).      

D \(y = \frac{3}{{\sqrt 6 }}x\). 

A \(2{x^2} - \frac{{7{y^2}}}{{24}} = 1\).

B \(\frac{{{x^2}}}{4} - \frac{{{y^2}}}{5} = 1\).       

C \(8{x^2} = {y^2} + 8\).

D \({x^2} - \frac{{{y^2}}}{5} = 1\). 

A \(\frac{{{x^2}}}{3} - {y^2} = 1\).

B \(\frac{{{x^2}}}{2} - \frac{{{y^2}}}{4} = 1\).       

C \(\frac{{{x^2}}}{6} - \frac{{{y^2}}}{5} = 1\).       

D \({x^2} - \frac{{{y^2}}}{3} = 1\).

A \({x_0} =  - \frac{9}{4}\).

B \({x_0} = \frac{9}{4}\).

C \({x_0} =  - \frac{{15}}{4}\).

D \({x_0} = \frac{{15}}{4}\).

A \({M_1}\left( {0;3} \right),\,\,{M_2}\left( {0; - 3} \right)\).

B \({M_1}\left( {5;0} \right),\,\,{M_2}\left( { - 5;0} \right)\).

C \({M_1}\left( { - 1;2} \right),\,\,{M_2}\left( {1; - 2} \right)\).

D \({M_1}\left( {1;3} \right),\,\,{M_2}\left( {1; - 3} \right)\)

A 8

B 5

C \(\frac{1}{2}\).

D \(\frac{8}{5}\). 

A \(M\left( {\frac{{\sqrt 2 }}{2};\sqrt 3 } \right)\) hoặc \(M\left( {\frac{{\sqrt 2 }}{2}; - \sqrt 3 } \right)\).     

B \(M\left( {\sqrt 3 ;\sqrt 2 } \right)\) hoặc \(M\left( {\sqrt 3 ; - \sqrt 2 } \right)\).

C \(M\left( {\sqrt 2 ;\frac{{\sqrt 3 }}{2}} \right)\) hoặc \(M\left( {\sqrt 2 ; - \frac{{\sqrt 3 }}{2}} \right)\).     

D \(M\left( {\sqrt 2 ;\sqrt 3 } \right)\) hoặc \(M\left( {\sqrt 2 ; - \sqrt 3 } \right)\).

A \((E):\frac{{{x^2}}}{{25}} + \frac{{{y^2}}}{9} = 1\).

B \((E):\frac{{{x^2}}}{{32}} + \frac{{{y^2}}}{{16}} = 1\).

C \((E):\frac{{{x^2}}}{{25}} + \frac{{{y^2}}}{{16}} = 1\).

D \((E):\frac{{{x^2}}}{{16}} + \frac{{{y^2}}}{9} = 1\).

A \(C\left( {\sqrt 2 ;2} \right)\).

B \(C\left( {\sqrt 3 ;2} \right)\). 

C \(C\left( {\frac{{3\sqrt 2 }}{2};\sqrt 2 } \right)\).

D \(C\left( {\sqrt 2 ;1} \right)\).

A \(\frac{{{x^2}}}{{16}} + \frac{{{y^2}}}{{\frac{{16}}{3}}} = 1\).

B \(\frac{{{x^2}}}{{16}} + \frac{{{y^2}}}{9} = 1\). 

C \(\frac{{{x^2}}}{{25}} + \frac{{{y^2}}}{{16}} = 1\).

D \(\frac{{{x^2}}}{{25}} + \frac{{{y^2}}}{9} = 1\).