A.\(m = \dfrac{{3\sqrt 2  - 2}}{4}\)
B.\(m = \dfrac{{\sqrt 2  + 2}}{4}\)
C.\(m = \dfrac{{3\sqrt 2  - 4}}{4}\)
D.\(m = \dfrac{{\sqrt 2  + 4}}{4}\)

A.\(y = x + 1\) và  \(y = \dfrac{1}{4}x + \dfrac{1}{2}\).
B.\(y = x + 1\) và  \(y = \dfrac{1}{4}x - \dfrac{1}{2}\).
C.\(y = x - 1\) và  \(y = \dfrac{1}{4}x - \dfrac{1}{2}\).
D.\(y = x - 1\) và  \(y = \dfrac{1}{4}x + \dfrac{1}{2}\).

A.\(m = 0;m =  - 2\)
B.\(m = 0;m =  - 4\)
C.\(m = 0;m =  - 6\)
D.\(m = 0;m =  - 1\)

A.\(x = 1 + \sqrt 3 \)
B.\(x = 1 \pm \sqrt 3 \)
C.\(x = 1 - \sqrt 3 \)
D.\(x = 1 \pm \sqrt 2 \)

A.\(\left( {x;y} \right) \in \left\{ {\left( { - \sqrt 2 ;4} \right);\left( {\sqrt 2 ;4} \right);\left( {0;1} \right);\left( {1;3} \right)} \right\}\)
B.\(\left( {x;y} \right) \in \left\{ {\left( { - \sqrt 2 ;4} \right);\left( {\sqrt 2 ;4} \right);\left( {0;1} \right);\left( { - 1;3} \right)} \right\}\)
C.\(\left( {x;y} \right) \in \left\{ {\left( { - \sqrt 2 ;4} \right);\left( {\sqrt 2 ;4} \right);\left( {0;2} \right);\left( {1;3} \right)} \right\}\)
D.\(\left( {x;y} \right) \in \left\{ {\left( { - \sqrt 2 ;4} \right);\left( {\sqrt 2 ;4} \right);\left( {0;2} \right);\left( { - 1;3} \right)} \right\}\)

A.
B.
C.
D.

A.\(\dfrac{{\sqrt 2 }}{4}{\left( {\dfrac{{2a}}{{2 + \sqrt {2 - \sqrt 2 } }}} \right)^2}\)
B.\(\dfrac{{\sqrt 2 }}{4}{\left( {\dfrac{{2a}}{{2 + \sqrt {2 + \sqrt 2 } }}} \right)^2}\)
C.\(\dfrac{{\sqrt 2 }}{4}{\left( {\dfrac{{2a}}{{2 - \sqrt {2 - \sqrt 2 } }}} \right)^2}\)
D.\(\dfrac{{\sqrt 2 }}{4}{\left( {\dfrac{{2a}}{{2 - \sqrt {2 + \sqrt 2 } }}} \right)^2}\)

A.
B.
C.
D.

A.\(x = 2018\)
B.\(x = 2019\)
C.\(x = 2020\)
D.\(x = 2021\)

A.
B.
C.
D.