lngab.py

Created on February 11, 2022

356 Bytes

e**x=5    e**x=-3
x=ln5     pas de solution 

a)x=lna avec a >0<->a = e**x

b)ln1=0 ; lne=1 ; ln1/e=-1

c) pour tout x, lne**x=x

d)pour tout x strictement positif,
e**lnx=x

ln(x*y)=lnx+lny
ln1/x=-lnx
lnx/y=lnx-lny
lnracine de x=1/2lnx
lnx**n=nlnx
lnx=lny<->x=y
lnx<lny<->x<y

lim lnx=-infini et lim lnx=+inf
x->0                x->+infi
x>0

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