
Logaritamska funkcija
Presentation
•
Mathematics
•
10th Grade
•
Easy
Olivera Veljovic
Used 32+ times
FREE Resource
8 Slides • 10 Questions
1
Logaritamska funkcija

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Logaritamska funkcija
Neka je x>0 , tada za svako a>0, a=1 postoji logax .
Logaritamsku funkciju y=logax, f:R+→R definišemo kao preslikavanje kojim se pozitivan broj x preslikava u realan broj logax .
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Primer1:
Ispitati i skicirati grafik funkcije y=log2x .
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y=log2x
Oblast definisanosti: xϵ(0,∞)
Nula funkcije: x=1, y=0
Presek sa y-osom: nema
Znak: xϵ(0,1) y<0, xϵ(1,∞) y>0
Monotonost: xϵ(0,+∞)y↑
Vertikalna asimptota je prava x=0 (y-osa)
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Primer2:
Ispitati i skicirati grafik funkcije
y=log21x
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y=log21x
Domen: xϵ(0, +∞)
Nula funkcije: x=1, y=0
Presek sa y-osom: nema
Znak: y>0 xϵ(0,1); y<0 xϵ(1,+∝)
Monotonost: xϵ(0,+∞) y↓
Vertikalna asimptota je x=0 (y-osa)
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y=ax i y=logax
Funkcije y=ax i y=logax, a>0, a=1 su inverzne. Njihovi grafici su simetrični u odnosu na pravu y=x .
Na slici je slučaj kada je a>1
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y=ax i y=logax
Na slici je slučaj kada je 0<a<1
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Multiple Choice
Eksponencijalni zapisa funkcije
y=logax je:x=ay
y=ax
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Multiple Choice
Eksponencijalni zapis logaritma
log28=323=8
32=8
28=3
82=3
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Multiple Choice
Logaritamski zapis eksponencijalnog zapisa
1621=4 jelog416=2
log416=2
log164=21
log4 21=16
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Multiple Choice
Na slici je nacrtana funkcija
y=log2x :13
Multiple Choice
Funkcija
y=log3x jerastuća
opadajuća
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Multiple Choice
Funkcija y=log31x je rastuća.
Tačno
Netačno
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Multiple Choice
Ako je f(x)=log2x , onda je f(1) :
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0
1
-2
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Multiple Choice
Na slici je nacrtana funkcija f(x)=log21x :
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Multiple Choice
Asimptota funkcije y=logax, x>0, a>0, a=1
je:
x osa
y osa
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Multiple Choice
Asimtota je prava
kojoj se grafik funkcije približava, a nikad je ne seče
koju grafik funkcije seče
koju grfaik funkcije dodiruje
Logaritamska funkcija

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