3.1 , (1, 2) (3, -1).
.
. = 3 = -1 : 3 + = 0. .
: 3 2 + C = 0, = -1.
: : 3 1 = 0.
3.2 . , , 8 2.
.
: , a = b = 1; ab/2 = 8; a = 4; -4.
a = -4 .
: + 4 = 0.
3.3 , (-2, -3) .
.
: , 1 = 1 = 0; x2 = -2; y2 = -3.
3.4 : y = -3x + 7; y = 2x + 1.
. , , : .
k1 = -3; k2 = 2 tgj = ; j = p/4.
3.5 (0; 1), B(6; 5), C(12; -1). , .
.
: ; 4x = 6y 6;
2x 3y + 3 = 0;
: Ax + By + C = 0 y = kx + b.
k = . y = . .. , : b = 17. : .
: 3x + 2y 34 = 0.
2 .
3.6 , 2x2 + 2y2 8x + 5y 4 = 0.
. . :
x2 + y2 4x + 2,5y 2 = 0
x2 4x + 4 4 + y2 + 2,5y + 25/16 25/16 2 = 0
(x 2)2 + (y + 5/4)2 25/16 6 = 0
(x 2)2 + (y + 5/4)2 = 121/16
(2; -5/4); R = 11/4.
3.7 , F1(0; 0), F2(1; 1), 2.
. : . :
2c = , , a2 b2 = c2 = ½
2 = 2, = 1, b =
: .
3.8 , 2,
. c2 = 25 9 = 16.
: c2 = a2 + b2 = 16, e = c/a = 2; c = 2a; c2 = 4a2; a2 = 4;
b2 = 16 4 = 12.
: - .
3.9 2 = 8 , 4.
. , = 4.
r = x + p/2 = 4; :
x = 2; y2 = 16; y = 4. : M1(2; 4), M2(2; -4).
3.10.
.
.
: .
|
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. : , .
, λ1, : , = . , = .
, : .
.
, : . , x² y² λ1 λ2.
:
,
.
: .
: , 8: - .
3.11. , , .
.
: .
, , : ,
:
. .
:
.
: .
, , .
, , , .
3.12. (-4;2) , 30 (6;-2).
.
.
.
, , .. .
.
3.13 , , (4; -3; 12) ,
.
, A = 4/13; B = -3/13; C = 12/13, :
A(x x0) + B(y y0) + C(z z0) = 0.
3.14 , (2, -1, 4) (3, 2, -1) + + 2 z 3 = 0.
. : A x + B y + C z + D = 0, (A, B, C). (1, 3, -5) . , , (1, 1, 2). .. , ,
, (11, -7, -2). .. , , .. 11×2 + 7×1 - 2×4 + D = 0; D = -21.
, : 11 x - 7 y 2 z 21 = 0.
3.15 , :
.
, , z = 0. :
;
2x 9x 7 = 0;
x = -1; y = 3;
: A(-1; 3; 0).
: .
:
3.16 1(1; 0; 3), A2(2; -1; 3), A3(2; 1; 1), A4(1; 2; 5).
1. 12.
.
2. 12 14.
.
3. 14 123.
. 123 .
= (2-1; 1-0; 1-3) = (1; 1; -2);
.
-4 4 = -8.
g g = 900 - b.
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4. 123.
. , .
2x + 2y + 2z 8 = 0
x + y + z 4 = 0.