(5) ¹0, , ,
y = kx + b | (6) |
k = A / B, b =/. , k= tg a, a - , . (6) b .
, (0;0)
(7) |
(5) ¹0, ,
x / a + y / b =1 | (8) |
=/, b =/.
. (8) , b . b .
, 1(x1; y1) 2(x2; y2)
(9) |
1.
, b =2 k =3.
:
(6), :
=3 2.
: =3 2.
2.
, =2,5 b =1,5.
:
(8) :
/2,5+/1,5=1.
:
(2/5)+(2/3)=1 6+1015=0.
: 6+1015=0.
3.
25+10=0.
: 1) ;
2) ;
3) .
:
1) , :
5=2+10 =(2/5)+2.
k =2/5; b =2.
2) (10):
2/(10)5/(10)=1.
=5; b =2.
3) :
4.
, (1;5).
:
(9)
;
y=5 x;
5 x+ y=0 .
:
5.
, (2;3)
(4;5).
:
(9) 1=2, 1=3, 2=4, 2=5, :
((3))/(5(3))=(2)/(42) (+3)/8=(2)/(6), 4(2)=3(+3).
4+3+1=0.
: 4+3+1=0
6.
(1;1), (5;7), (9;3).
D, BE, CN.
:
D (4):
=(59)/2=2;
=(7+3)/2=5,
. . D (2; 5).
AD , :
( 1)/(51)=( +1)/(2+1) ( 1)/4=( +1)/(1),
. . 4 + +3=0.
: AD 4++3=0.
CN .
y1= k 1 x + b 1 y2 = k 2 x + b 2
|
|
tg a =(k 2 k 1)/(1+ k 2 k 1) | (10) |
, , ..
k 2= k 1.