EXERCICE 1 POUR 20 POINTS URGENT DÉTAILLEZ LES CALCULS!!!!!.... Pergunta de ideia deLareinedesneiges

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EXERCICE 1 POUR 20 POINTS URGENT DÉTAILLEZ LES CALCULS!!!!!

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1-
x + 2 = 28
x = 28 - 2
x = 26

2-
2x = 28
x = 28/2
x = 14

3-
x - 13 = 3
x = 3 + 13
x = 16

4-
x/13 = 3
x/13 = 39/13
x = 39

5-
5x + 3 = 18
5x = 18 - 3
5x = 15
x = 15/5
x = 3

6-
5 (x + 3) = 18
5x + 15 = 18
5x = 18 - 15
5x = 3
x = 3/5
x = 0,6

7-
7 - 3x + 2 = - 5x - 6
- 3x + 5x = - 6 - 7 - 2
2x = - 15
x = - 15/2
x = - 7,5

8-
3 (x + 2) = - (5x - 6)
3x + 6 = - 5x + 6
3x + 5x = 6 - 6
8x = 0
x = 0/8
x = 0

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20 POINTS!!!!!!!! La question b seulement

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