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Kassandra37
@Kassandra37
April 2019
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Pouvez-vous m'aider svp
a) résoudre:
- x=3
b) résoudre (3-x)(7+x)=0
c) résoudre 2x-5=3x+12
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winner123
Verified answer
Bonjour
a) 7/5 - x = 3
tu mets sous 5
7/5 - 5 x = 15
7 - 5 x = 15
- 5 x = 15 - 7
- 5 x = 8
x = - 8/5
b) ( 3 - x) ( 7 + x) = 0
soit 3 - x = 0 donc - x = - 3 et x = 3
soit 7 + x = 0 et x = - 7
c) 2 x - 5 = 3 x + 12
2 x - 3 x = 12 + 5
- x = 17
x = -17
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Verified answer
Bonjoura) 7/5 - x = 3
tu mets sous 5
7/5 - 5 x = 15
7 - 5 x = 15
- 5 x = 15 - 7
- 5 x = 8
x = - 8/5
b) ( 3 - x) ( 7 + x) = 0
soit 3 - x = 0 donc - x = - 3 et x = 3
soit 7 + x = 0 et x = - 7
c) 2 x - 5 = 3 x + 12
2 x - 3 x = 12 + 5
- x = 17
x = -17