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A ${A_1}\left( { - 16;0} \right);\,\,{A_2}\left( {16;0} \right);\,\,{B_1}\left( {0; - 9} \right);\,\,{B_2}\left( {0;9} \right)$

B ${A_1}\left( { - 4;0} \right);\,\,{A_2}\left( {4;0} \right);\,\,{B_1}\left( {0; - 3} \right);\,\,{B_2}\left( {0;3} \right)$

C ${A_1}\left( { - 4;0} \right);\,\,{A_2}\left( {4;0} \right);\,\,{B_1}\left( {0; - 9} \right);\,\,{B_2}\left( {0;9} \right)$

D ${A_1}\left( { - 16;0} \right);\,\,{A_2}\left( {16;0} \right);\,\,{B_1}\left( {0; - 3} \right);\,\,{B_2}\left( {0;3} \right)$

A $2;\,\,4$

B $4;\,\,2$

C $2\sqrt 2 ;\,\,4$

D $4;\,\,2\sqrt 2$

A $6$      

B $2\sqrt {41}$

C $3$      

D $\sqrt {41}$

A ${F_1}( - 2;0),\,\,{F_2}(2;0)$

B ${F_1}( - 1;0),\,\,{F_2}(1;0)$

C ${F_1}( - 2\sqrt 2 ;0),\,\,{F_2}(2\sqrt 2 ;0)$

D ${F_1}( - \sqrt 2 ;0),\,\,{F_2}(\sqrt 2 ;0)$

A $y = {3 \over 4}x;\,\,\,y =  - {3 \over 4}x$

B $y = {4 \over 3}x;\,\,y =  - {4 \over 3}x$        

C $y = {9 \over {16}}x;\,\,\,y =  - {9 \over {16}}x$        

D $y = {{16} \over 9}x;\,\,\,\,y =  - {{16} \over 9}x$

A $e = {5 \over 4}$

B $e = {4 \over 5}$        

C $e = {3 \over 4}$

D $e = {4 \over 3}$

A ${{{x^2}} \over {16}} - {{{y^2}} \over {25}} = 1$

B ${{{x^2}} \over {25}} - {{{y^2}} \over 9} = 1$          

C ${{{x^2}} \over 9} - {{{y^2}} \over {25}} = 1$

D ${{{x^2}} \over {16}} - {{{y^2}} \over 9} = 1$

A ${{{x^2}} \over {16}} - {{{y^2}} \over {25}} = 1$

B ${{{x^2}} \over {25}} - {{{y^2}} \over 9} = 1$          

C ${{{x^2}} \over 9} - {{{y^2}} \over {25}} = 1$          

D ${{{x^2}} \over {16}} - {{{y^2}} \over 9} = 1$

A ${{{x^2}} \over {16}} - {{{y^2}} \over {25}} = 1$

B ${{{x^2}} \over {25}} - {{{y^2}} \over 9} = 1$          

C ${{{x^2}} \over 9} - {{{y^2}} \over {25}} = 1$

D ${{{x^2}} \over {16}} - {{{y^2}} \over 9} = 1$

A ${{{x^2}} \over {36}} - {{{y^2}} \over {28}} = 1$

B ${{{x^2}} \over {36}} - {{{y^2}} \over 8} = 1$

C ${{{x^2}} \over {36}} - {{{y^2}} \over {16}} = 1$

D ${{{x^2}} \over {16}} - {{{y^2}} \over {28}} = 1$

A ${{{x^2}} \over {36}} - {{{y^2}} \over {64}} = 1.$

B ${{{x^2}} \over {18}} - {{{y^2}} \over {32}} = 1$

C ${{5{x^2}} \over 8} - {{{y^2}} \over 2} = 1$

D ${{5{x^2}} \over {32}} - {{5{y^2}} \over {18}} = 1$

A ${{{x^2}} \over 4} - {{{y^2}} \over 1} = 1$   

B ${{{x^2}} \over 1} - {{{y^2}} \over 4} = 1$

C ${{{x^2}} \over 4} - {{{y^2}} \over 4} = 1$

D ${{{x^2}} \over 1} - {{{y^2}} \over {16}} = 1$

A $e = {2 \over 3}$

B $e = {4 \over 3}$        

C $e = {2 \over {\sqrt 3 }}$       

D $e = {4 \over {\sqrt 3 }}$

A ${1 \over {\sqrt 2 }}$

B $\sqrt 2$

C 2

D ${1 \over 2}$

A ${{{x^2}} \over 9} - {{{y^2}} \over 7} = 1$

B ${{{x^2}} \over 9} - {{{y^2}} \over {17}} = 1$          

C ${{{x^2}} \over {16}} - {{{y^2}} \over {17}} = 1$

D ${{{x^2}} \over 9} - {{{y^2}} \over {16}} = 1$

A ${{{x^2}} \over 9} - {{{y^2}} \over 7} = 1$

B ${{{x^2}} \over 9} - {{{y^2}} \over {17}} = 1$

C ${{{x^2}} \over {16}} - {{{y^2}} \over {17}} = 1$

D ${{{x^2}} \over 9} - {{{y^2}} \over {16}} = 1$

A $\cos \varphi  = {{\left| {{b^2} - {a^2}} \right|} \over {{a^2} + {b^2}}}$    

B $\cos \varphi  = {{\left| {{b^2} - {a^2}} \right|} \over {2\sqrt {{a^2} + {b^2}} }}$

C $\cos \varphi  = {{\left| {{b^2} - {a^2}} \right|} \over {4\left( {{a^2} + {b^2}} \right)}}$

D $\cos \varphi  = {{4\left| {{b^2} - {a^2}} \right|} \over {\sqrt {{a^2} + {b^2}} }}$

A $e = 2$ hoặc $e = {2 \over {\sqrt 3 }}$. 

B $e = 2$ hoặc $e = {4 \over {\sqrt 3 }}$. 

C $e = 1$ hoặc $e = {2 \over {\sqrt 3 }}$. 

D $e = 1$ hoặc $e = {4 \over {\sqrt 3 }}$

A $y = 2x,\,\,\,y =  - 2x$

B $y = 5x,\,\,\,y =  - 5x$

C $y = x,\,\,\,y =  - x$

D $y = 12x,\,\,\,y =  - 12x$

A $k = 1$

B $k = \sqrt 2$

C $k = {b \over a}$       

D $k = {a \over b}$