A. S = 1

B. S = 0

C. S = 2

D. S = 4

A.  ${\left(x-2\right)}^2+{\left(y+2\right)}^2+{\left(z-3\right)}^2=36$

B.  ${\left(x-1\right)}^2+{\left(y-5\right)}^2+{\left(z+3\right)}^2=9$

C.  ${\left(x-2\right)}^2+{\left(y-5\right)}^2+{\left(z+1\right)}^2=16$

D.  ${\left(x-1\right)}^2+{\left(y-2\right)}^2+{\left(z+2\right)}^2=25$

A.  $\left(R\right):x+3y+5z+5=0.$

B.  $\left(R\right):x-3y+5z-7=0.$

C.  $\left(R\right):2x-y-4z-4=0.$

D.  $\left(R\right):2x+y-4z=0.$

A. $\stackrel{\to }{u}$ = (1;3;5).

B.  $\stackrel{\to }{u}$ = (-1;3;-5).

C.  $\stackrel{\to }{u}$ = (2;1;-1).

D.  $\stackrel{\to }{u}$ = (1;-2;1).

A.  ${\left(x-1\right)}^2+{\left(y-2\right)}^2+{\left(z+5\right)}^2=25$

B.  ${\left(x+1\right)}^2+{\left(y+2\right)}^2+{\left(z-5\right)}^2=25$

C.  ${\left(x-1\right)}^2+{\left(y-2\right)}^2+{\left(z+5\right)}^2=5$

D.  ${\left(x+1\right)}^2+{\left(y+2\right)}^2+{\left(z-5\right)}^2=36$

A.  $\left\{\begin{array}{l}x=2+t\\ y=2-t\\ z=-1+2t\end{array}\right.$

B.  $\left\{\begin{array}{l}x=1+2t\\ y=-1+2t\\ z=2-t\end{array}\right.$

C.  $\left\{\begin{array}{l}x=1+2t\\ y=-1-t\\ z=1+2t\end{array}\right.$

D.  $\left\{\begin{array}{l}x=2+2t\\ y=2+2t\\ z=-1-t\end{array}\right.$

A. (3;2;-1)

B. (-3;2;-1)

C. (3;-2;1)

D. (-3;2;1)

A. 1

B. 2

C. 0

D. Vô số

A.  $\stackrel{\to }{n}=\left(-1;-2;1\right)$ 

B.  $\stackrel{\to }{n}=\left(1;2;1\right)$

C.  $\stackrel{\to }{n}=\left(-2;-4;-2\right)$

D.  $\stackrel{\to }{n}=\left(\frac{1}{2};1;\frac{1}{2}\right)$ 

A.  $\stackrel{\to }{n_1}$ = (2; -2; 1)

B.  $\stackrel{\to }{n_2}$ = (1; 1; 0)

C.  $\stackrel{\to }{n_3}$ = (2; -2; 5)

D.  $\stackrel{\to }{n_4}$ = (-2; 1; 2)