.
:
1- : ( ) :
= 2*0*1 2*3*1 4*1*1 + 4*3*1 + (-1)*1*3 - (-1)*3*0 = -1
2- : :
=
: -1
(, ).
:
AX = B A - n,
B - n q,
A- - A ( = E - ):
=
, A , .. det A ≠ 0.
,
- , .
=
: X = A-1B
*
:
.
1- 4
2; 3; 4 1 , 8; 2; 2
2- 3-
2- -0.5
1; 4 2 , -0.75; 0.5
3- -1
1; 4 3 , 0.5; -1
:
4.3 , .
.
: , , ,
=
=
(2)
:
( (
( )
, (2),
=14
:
5.3 , , . , .
A (3;3;1); B (5;5;2); C (4;1; 1).
1)
,
-
-
= {5-3;5-3;-2-(-1)}={2;2;-1}
= {4-3;1-3;1-(-1)}={1,-2,2}
=2
2)
=
3)
: ;
6.3 A, B, C, D.
A (2;1;2), B (1;2;1), C (3;2;1), D (4;2;5).
. :
= {1-2,2-(-1),-1-2}={-1,3,-3}
= {3-2, 2-(-1), 1-2}={1,3,-1}
= {-4-2,2-(-1),5-2}={-6,3,3}
A, B, C, D , , .
A,B,C,D- , ( ABCD).
, , , . ,
|
|
:
7.3. (4;5), (8,13), (14;7). .
(x,y) .
1) :
:
BC:
:
2) , ,, N,M,T
N:
M:
T:
3) :
NO: ( , )
. , NO
,
4x+8y-96=0
MO: ( , )
. , MO
,
6x-6y-6=0
TO: ( , C )
C. C , TO
,
-10x-2y+102=0
4) (x,y) MO,NO
, ,
MO,NO (8
: , ==
=
=
=
: (8
8.3. , .
:
, B .
, , :
(1)
Y, =0, , , , (1) :
(-(-2))+0(y-3)+C(z-4)=0 Ax+2A+Cz-4C=0 (2)
,
2A+2A-C-4C=0
4A-5C=0
A= C, =5 ( , )), =4
(2) 5x+10+ -16=0 5x+4z-6=0
2- :
, ,
= ( Y), , . .
=
5(x+2) +0 (y-3) +4(z-4)=0 (1) 5x+10+4z-16=0 5x+4z-6=0
(-2,3,4)
: 5x+4z-6=0
9.3. (2;11;7) .
, .
, (2;11;7):
, - , . P), ,
,
, :
|
|
:
(1)
(2)
:
x,y,z (1) (2)
( (
6t=-30
t=-5
t=-5 (1), :
(3,1,2) .
-3+2+2-1=0
: (3,1,2)
10.3 , , , , , . , , .
,
O' (0, 0) (x,y)- () ( xy), (XY) ( O'XY), (0, 0) - O' (Oy),
- O' b
O' (1, -2) - , ( )
= 12 - , b = 5 - .
:
, Y= , .. Y== ,
- , , ; X= , .. X=12* , , , -1=
, , , , 2 2b
: O' (1, -2), = 12, b = 5
-1=
:
1. .. . 1 .
2. .. . . . . .
3. .. . . 1.