Sagot :
bonjour
10 x = 7
x = 7/10
11 x - 6 = 7 x + 9
11 x - 7 x = 9 + 6
4 x = 15
x = 15/4
- 6 x + 1 = x - 13
- 6 x - x = - 13 - 1
- 7 x = - 14
x = 2
2.5 x + 2 = 4.3 x
2.5 x - 4.3 x = - 2
- 1.8 x = - 2
x = 20/18 = 10/9
Réponse :
h) -6x + 1 = x - 13
=> -6x + 1 + 13 + 6x = x - 13 + 6x + 13
=> 14 = 7x
=> 7x = 14
Donc, x = 2
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l) 2,5x + 2 = 4,3x
=> 2,5x - 4,3x + 2 - 2 = 4,3x - 2 - 4,3x
=> -1.8x = -2
=> x = -2 / -1.8 = 2/1.8
Donc, x = 20/18 = 10/9