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1. b, :

) (1; -3; 8), b (4; -2; -6);

) (-3; -8; 9), b (-7; -1; -2);

) (-10; 5; 6), b (4; 2; 5).

 
 


2. b, :

 
 


) || = 8, |b| = 7, (, b) = 45;

 
 


) || = 10, |b|=11, (, b) = 120;

 
 


) || = 5, |b|=6, (, b) = 90.

 

3. (4, -2; ) b (5, , -3).

× b = 8?

 

4. b :

) (5; -1; -2) b (2; 6; -3);

) (2; -1; 2) b (-4; 1; 3);

5. , (1; -4; -1), (4; 7; 0), (-2; 1; 6).

 

6. n :

) (2; -1; 3), b (1; 3; n);

) a (n; -2; 1), b (n; -n; 1);

) (4; 2n; -1), b (-1; 1; n)?

 

7. : (1; 0; 1), (-1; 1; 2), (0; 2; -1). z D(0; 0; c), CD .

 

8., ABCD (6; -4; 2),

(3; 2; 3), (0; 1; 0), D(3; -5; -1) .

 

9. (0; 2; -1), (1; 0; 1), (-1; 1; 2). D z, AD^BC.

 

10. , = 12. :

) ×; ) × .

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