, , A B (A<B), sign F (A) ¹ sign F (B). (. .3.4), , P , (A, F (A)) (B, F (B)).
.3.4.
, : Y (x) = k x + c.
k c :
F (A) = k A + c; F (B) = k B + c.
, :
; c = F (A) - k A.
P X
kP + c = 0.
, :
![]() | (3.4) |
(3.3), , .3.4, B A . , ,
![]() | (3.5) |
.. .
, , P .