A.Cu.
B.Na.
C.Al.
D.K.

A.\( - 4\)
B.\( - 2\)
C.\( - 3\)
D.\( - 5\)

A.\(u = 40co{\rm{s}}\left( {100\pi t + \frac{\pi }{4}} \right)\left( V \right)\)
B.\(u = 40co{\rm{s}}\left( {100\pi t - \frac{\pi }{4}} \right)\left( V \right)\)
C.\(u = 40\sqrt 2 co{\rm{s}}\left( {100\pi t - \frac{\pi }{4}} \right)\left( V \right)\)
D.\(u = 40\sqrt 2 co{\rm{s}}\left( {100\pi t + \frac{\pi }{4}} \right)\left( V \right)\)

A.\(z = 4 + 3i\)
B.\(z = 3 - 4i\)
C.\(z = 3 + 4i\)
D.\(z =  - 3 + 4i\)

A.\(12 + 5i\)
B.\( - 12 + 5i\)
C.\(12 - 5i\)
D.\( - 12 + 8i\)

A.\(r = 2\)
B.\(r = 2\sqrt 2 \)
C.\(r = 4\)
D.\(r = 3\sqrt 2 \)

A.\(G\left( {\frac{1}{3}; - 1;\frac{5}{3}} \right)\)
B.\(G\left( {\frac{1}{2}; - \frac{3}{2};\frac{5}{2}} \right)\)
C.\(G\left( {1; - 3;5} \right)\)
D.\(G\left( {\frac{5}{3};0;\frac{1}{3}} \right)\)

A.\(\frac{{2x}}{{{x^2} + 2}}\)
B.\(\frac{1}{{{x^2} + 2}}\)
C.\(\frac{x}{{{x^2} + 2}}\)
D.\(2x\left( {{x^2} + 2} \right)\)

A.\(x = \frac{5}{2}\)
B.\(x = 3\)
C.\(x = 2\)
D.\(x = \frac{3}{2}\)

A.\(\int {f\left( x \right)dx}  = {x^3} - {x^2} + x + C\)
B.\(\int {f\left( x \right)dx}  = 3{x^3} - 2{x^2} + x + C\)
C.\(\int {f\left( x \right)dx}  = 6{x^3} - 4{x^2} + 2x + C\)
D.\(\int {f\left( x \right)dx}  = \frac{{{x^3}}}{3} - \frac{{{x^2}}}{2} + x + C\)