A.  ${\left(x-1\right)}^2+{\left(y-1\right)}^2+{\left(z+3\right)}^2=21$

B.  ${\left(x-1\right)}^2+{\left(y-2\right)}^2+{\left(z+3\right)}^2=25$

C.  ${\left(x+1\right)}^2+{\left(y+2\right)}^2+{\left(z+3\right)}^2=21$

D.  ${\left(x+1\right)}^2+{\left(y+2\right)}^2+{\left(z+3\right)}^2=25$

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

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

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

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

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

B.  ${\left(x-3\right)}^2+{\left(y+3\right)}^2+{\left(z-1\right)}^2=25.$

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

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

A. (4; -3; 3)

B. (4; -3; -3)

C. (4; 3; 3)

D. (-4; -3; -3)

A. 4

B. 1

C. 2

D. 3

A.  $\left\{\begin{array}{l}\begin{array}{l}x=2+2s\\ y=1-s\end{array}\\ z=-1+3s\end{array}\right.$

B.  $\left\{\begin{array}{l}\begin{array}{l}x=2+3s\\ y=-1+s\end{array}\\ z=3-s\end{array}\right.$

C. $\left\{\begin{array}{l}\begin{array}{l}x=2+2s\\ y=1-s\end{array}\\ z=1+3s\end{array}\right.$

D.  $\left\{\begin{array}{l}\begin{array}{l}x=2+3s\\ y=-1+s\end{array}\\ z=-3-s\end{array}\right.$

A. I(1;2;3)  và  R=5.

B. I(-1;-2;-3)  và R=5. 

C. I(1;2;3)  và R=25.

D. I(-1;-2;-3)  và  R=25

A.  $\left(P\right):x+2y+3z+6=0$

B.  $\left(P\right):x+2y+z-2=0$

C.  $\left(P\right):x-2y+z-6=0$

D.  $\left(P\right):3x+2y+2z-4=0$

A. -4.

B. 8

C. 0

D. 2