A.\({30^0}\)
B.\({120^0}\)
C.\({60^0}\)
D.\({90^0}\)

A.\(\dfrac{3}{2}\)
B.\(8\)
C.\(\dfrac{1}{8}\)
D.\(6\)

A.\({30^0}\)
B.\({90^0}\)
C.\({120^0}\)
D.\({60^0}\)

A.\(x = 6\)
B.\(x = 4\)
C.\(x = 7\)
D.\(x = 1\)

A.\(3\)
B.\(2\)
C.\( - 2i\)
D.\( - 2\)

A.\(D = \left( {1;3} \right)\)
B.\(D = \left( { - \infty ;1} \right) \cup \left( {1;3} \right)\)
C.\(D = \left( {3; + \infty } \right)\)
D.\(D = \left( { - \infty ;3} \right)\)

A.\(k = \dfrac{{ - 1 + \sqrt 2 }}{2}\)
B.\(k = \dfrac{{1 + \sqrt 5 }}{4}\)
C.\(k = \dfrac{{ - 1 + \sqrt 5 }}{2}\)
D.\(k = \dfrac{{ - 1 + \sqrt 5 }}{4}\)

A.Tơ capron.
B.Tơ lapsan.
C.Tơ olon.
D.Tơ nilon-6,6.

A.18,0 gam.
B.86,4 gam.
C.52,2 gam.
D.34,2 gam.

A.C2H5O2N.
B.C3H7O2N.
C.C4H9O2N.
D.C5H11O2N.