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Meilleure réponse !
2014-04-09T21:07:36+02:00
Bonsoir

d) 1÷3x+5÷6=x
1/3x + 5/6 = x
4x/12 + 10/12 = 12x
4x - 12x = -10
-8x = -10
x = 10/8
x = 5/4

e) x÷8 = 7÷4
x/8 = 7/4
x/8 = 14/8
x = 14

f) x-7÷5 = 3÷10
x - 7/5 = 3/10
10x10 - 14/10 = 3/10
10x = 3 +14
10x = 17
x = 17/10
x = 1.7

g) 0,7x-4 = 0,3x + 0,8

0.7x - 0.3x = 0.8 + 4
0.4x = 4.8
x = 12