A.\({t^2} - 2\sqrt 2 t + 1 = 0\)
B.\({t^2} + t - 2\sqrt 2  = 0\)
C.\(t + \dfrac{1}{t} + 2\sqrt 2  = 0\)
D.\(t + \dfrac{1}{t} = 0\)

A.\(\left\{ 2 \right\}\)
B.\(\left\{ {0;2} \right\}\)
C.\(\left\{ {0;\dfrac{3}{2}} \right\}\)
D.\(\left\{ { \pm 2} \right\}\)

A.\(l = h\)
B.\(h = R\)
C.\({R^2} = {h^2} + {l^2}\)
D.\({l^2} = {h^2} + {R^2}\)

A.\(m > n\)
B.\(m = 0\)
C.\(m = n\)
D.\(m < n\)

A.36,8 giờ
B.30,2 giờ
C.26,9 giờ
D.18,6 giờ

A.\(\left( { - \infty ;1} \right]\)
B.\(\left( { - \infty ;0} \right)\)
C.\(\left( { - \infty ; - 2} \right)\)
D.\(\left( { - 1; + \infty } \right)\)

A.\(a <  - \dfrac{1}{5}\)
B.\(a >  - \dfrac{1}{5}\)
C.\(a >  - 5\)
D.\(a < 5\)

A.\(Q\)
B.\(N\)
C.\(P\)
D.\(M\)

A.\(I\left( { - \dfrac{1}{2};1;0} \right),\,\,R = \dfrac{1}{4}\)
B.\(I\left( {\dfrac{1}{2}; - 1;0} \right),\,\,R = \dfrac{1}{2}\)
C.\(I\left( {\dfrac{1}{2}; - 1;0} \right),\,\,R = \dfrac{1}{{\sqrt 2 }}\)
D.\(I\left( { - \dfrac{1}{2};1;0} \right),\,\,R = \dfrac{1}{2}\)

A.\(\left( { - 4; + \infty } \right)\)
B.\(\left( { - \infty ;0} \right)\)
C.\(\left( { - \infty ;1} \right)\)
D.\(\left[ {0; + \infty } \right)\)