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8/18/2019 Kiyal Cours
1/1
24
K
↖
W
1
x x
] [0; +∞
1 Wln
W
ln 1e = ln 1 0=
] [ ] [0; 0;x y ∀ ∈ +∞ ∀ ∈ +∞
ln lnx y x y = ⇔ = ln lnx y x y > ⇔ >
] [0;
ln y
x y
x y x e
∀ ∈ +∞ ∀ ∈
= ⇔ =
] [ ] [
( )
( )
0; 0;
ln ln ln
ln ln
1ln ln
ln ln ln
r
x y
xy x y
x r x
x x
x x y
y
∀ ∈ +∞ ∀ ∈ +∞
= +
=
= −
= −
( )r ∈
n W( )* ln lnn x x n x ∀ ∈ =
W
f WWWW f WWWW
( ) ( )[ ]ln f x u x = ( ) }0u x >{ / f u D x x D = ∈ ∈ ( ) ( )( )2ln f x u x =
( ) ( )ln f x u x = ( ) }0u x ≠{ / f u D x x D = ∈ ∈
W
( )lim lnx
x →+∞
= +∞ lnlim 0n
x
x
x →+∞=
( )0lim lnx x → = −∞>
( )0lim ln 0n
x x x → =>
1
lnlim 1
1x
x
x →=
−
( )
0
ln 1lim 1x
x
x →
+=
( )n *∈
W
lnx x ] [0;+∞
u I u I ( )[ ]lnx u x I