Bonjour Resoudre les equations et inequations A)log(2x-1)=0. [0.5;10] B log (x-7)=log(3-x) ]-7;3[ C log(3x+5)=log(3-x) [2;10] D
Mathématiques
prue10
Question
Bonjour
Resoudre les equations et inequations
A)log(2x-1)=0. [0.5;10]
B log (x-7)=log(3-x) ]-7;3[
C log(3x+5)=log(3-x) [2;10]
D log(x+2)=2. [0;100]
E log(2x+1)=2. [0;+infini[
F log(3x+1)=2log3. [0;+infini[
Resoudre les equations et inequations
A)log(2x-1)=0. [0.5;10]
B log (x-7)=log(3-x) ]-7;3[
C log(3x+5)=log(3-x) [2;10]
D log(x+2)=2. [0;100]
E log(2x+1)=2. [0;+infini[
F log(3x+1)=2log3. [0;+infini[
1 Réponse
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1. Réponse ProfdeMaths1
A)log(2x-1)=0. [0.5;10]
2x-1=1
x=1
S={1}
B log (x-7)=log(3-x) ]-7;3[
x-7=3-x
2x=10
x=5∉]-7;3[
S=∅
C log(3x+5)=log(3-x) [2;10]
3x+5=3-x
4x=-2
x=-1/2∉[2;10]
S=∅
D log(x+2)=2. [0;100]
x+2=100
x=98
S={98}
E log(2x+1)=2. [0;+infini[
2x+1=100
x=49,5
S={49,5}
F log(3x+1)=2log3. [0;+infini[
3x+1=9
x=8/3
S={8/3}