RE:(urgent) SVP a:5x+1=2x+19 b:8x+3=x+15 c:7,8i-8=1,3i+2
Mathématiques
lacrim93
Question
RE:(urgent)
SVP
a:5x+1=2x+19
b:8x+3=x+15
c:7,8i-8=1,3i+2
1 Réponse
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1. Réponse winner123
Bonsoir
a:5x+1=2x+19
5x -2x = 19 -1
3x = 18
x = 6
b:8x+3=x+15
8x -x = 15 -3
7x = 12
x = 12/7
c:7,8i-8=1,3i+2
7.8 i -1.3 i = 2 +8
6.5 i = 10
i = 10/6 ou 5/3