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^ b Û × b=0,

×bx +ay×by+az×bz=0

 

 

 

 

.

1. z (6; 0; 12) b (-8; 13; z) ?

. , .

ax bx+ ay by + az bz = 0,

6× (-8) + 0×13 + 12×z = 0,

-48 + 0 + 12z = 0,

12z = 48,

z = 4.

³. z = 4.

 

       
   


2. m n, (6; m; 1) b (18; 12; n)

?

. :

,

,

 

, = 4,

 

.

³. m = 4, n = 3.

 

 

3. , (3; 0; -4)

AD (0; 5; 0).

. AD.

:

S=||×|AD| sin j.

||= = = =5;

|AD|= = =5;

cos j = = = =0.

cos j= 0, j=90. sin j = sin 90 =1 S=5×5×1=25.

³. S = 25.

 

 

ײ.




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