, . , .
2.1.
1. ..
. :
. - 4, .
, -2.
O (0, 0), . , .
, 1/2 x 2 = 1/2 1.
, :
1 = 8 /5, x 2 = 4 /5, L = 16 /5 + 4 /5 = 4 .
. , , O (0, 0), , 4 , (8 /5, 4 /5).
2.2.
2. .
:
. OABD.
O 1. D (9, 0), O 1 (2, 3).
. , 58, D (9, 0), , , O 1 (2, 3).
3. :
:
. OABD. O 1 (6, 3).
(0,0) O 1.
, 3 x 1 + 2 x 2 = 15 , O 1.
: 3 x 1 + 2 x 2 = 15 -3/2, O 1 2/3. , 2 2/3,
: 1 = 51/13, x 2 = 21/13, L() = 1053/169.
, , (x 1 - 6)2 + (x 2 - 3)2 x 1, .
: 3 x 1 + 2 x 2 = 15, ,
x2=-3/2x1+15/2, tgx=-3/2.
: 1 = 51/13, x 2 = 21/13.
.
: , 52, O (0, 0). , 1053/169, E (51/13, 21/13).
|
|
2.3.
4.
:
. 4, (. 28.4). O 1 (2, l).
O 1. (0, 4),
. , , O 1 (2, l), , 13, (0, 4).
5.
:
. x1x2=4 x2=4/x1.; x1+x2=5 x2=5-x1
. , , .
O (0, 0). ,
(1, 4), (4, 1). , 17. D ,
D (2/3, 6) L(D) = 328/9, E (7, 4/7) L(E) = 2417/49.
. . , 17, (1, 4) B (4, 1), , 2417/49, E (7, 4/7).