.
/ | A | B | C | D | E |
36 | 50 | 72 | |||
16 | 23 | ||||
12 | |||||
4 |
, .
1.
1. , : 25 x 2 36 y 2 50 x 72 y + 3589 = 0.
2. AB = 25(36) < 0, (. 1, . 1.2), , , .
3. :
25(x 2 2 x) 36(y 2 + 2 y) + 3589 = 0;
25(x 1)2 36(y + 1)2 = 3589 + 25 36;
25(x 1)2 36(y + 1)2 = 3600;
.
4. X′O′Y′:
; | (12) |
(13) |
, (. III). X′O′Y′ , . 7.2, 90, .. OY, OX.
5. .
a = 10. b = 12.
.
ε = c/d = 1.56 > 1.
6. X′O′Y′, , (7.12), XOY.
a)
, O' XOY (1,1).
b) . , O'Y': x' = 0 O'X': y' = 0. (7.12) x = 1, , : y = 1.
) :
X'O'Y'
, ;
, ;
, XOY, A 1 (X 1, Y 1) = A 1(1; 11), A 2(X 2, Y 2) = A 2(1; 9).
d) . X'O'Y':
XOY: F 1(1; 16,6); F 2(1; 14,6).
e) .
L 1: y = 7,4; L 2: y = 5,4.
f) .
.
x 1,2 y 2,2 = 0.
.
x + 1,2 y + 0,2 = 0.
Γ 1: x 1,2 y 2,2 = 0; Γ 2: x + 1,2 y + 0,2 = 0.
7
25 x 2 36 y 2 50 x 72 y + 3589 = 0 | |
X'O'Y' ( ) | |
a = 10 b = 12 | |
(X,Y) (X',Y') | ; |
X'O'Y' | XOY | |
O' | (0, 0) | (1, 1) |
A 1 A 2 | (0; 10) (0; 10) | (1; 11) (1; 9) |
F 1 F 2 | (0; 15,6) (0; 15,6) | (1; 16,6) (1; 14,6) |
X'O'Y' | XOY | |
x' = 0 y' = 0 | x = +1 y = 1 | |
L 1 L 2 | y' = 6,4 y' = 6,4 | y = 7,4 y' = 5,4 |
Γ 1 Γ 2 | x' = 1,2 y'x' = 1,2 y' | x 1,2 y 2,2 = 0 x + 1,2 y + 0,2 = 0 |
8. 7.4 .
|
|
. 7.4
2.
1.
y 2 16 x + 6 y 23 = 0.
2. AB = 0 1 = 0, (. 1, .2); , C ≠ 0 (. 1, . 2.1), .
3. :
(y 2 + 6 y + 9) = 16 x + 23 + 9; (y + 3)2 = 16(x + 2).
4. X'O'Y'
(14) |
: (y')2 = 16 x'.
5. : 2 p = 16, p = 8.
6. :
) (. (14)). O' (2; 3).
b) : y' = 0, y + 3 = 0, .. y = 3.
c) F (p /2,0):
F (2, 3).
d) : z: X' = p/2; X' = 4; X + 2 = 4 X = 6.