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choco4
@choco4
January 2021
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ex 49 il faut résoudre l'équation. svp
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PAU64
Exercice 49 :
a) 2 (x + 1) = - 5
2 * x + 2 * 1 = - 5
2x + 2 = - 5
2x = - 5 - 2
2x = - 7
x = - 7/2
x = - 3,5
b) 5x = 6 (2 + x)
5x = 6 * 2 + 6 * x
5x = 12 + 6x
5x - 6x = 12
- x = 12
x = - 12
c) 7 + 3 (x - 1) = 8
7 + 3 * x + 3 * (- 1) = 8
7 + 3x - 3 = 8
3x = 8 - 7 + 3
3x = 4
x = 4/3
d) 9 (3 - x) = - 10x
9 * 3 + 9 * (- x) = - 10x
27 - 9x = - 10x
10x - 9x = - 27
x = - 27
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choco4
January 2021 | 0 Respostas
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choco4
January 2021 | 0 Respostas
resoudre chaque equation a) 2x + 1 = -4 b) 7+5x=4 c) 4x-3 =-7 d) -5+3x=1 e) -7x+6=5. f) 8-9x= -2 . s'il vous plait aider moi
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a) 2 (x + 1) = - 5
2 * x + 2 * 1 = - 5
2x + 2 = - 5
2x = - 5 - 2
2x = - 7
x = - 7/2
x = - 3,5
b) 5x = 6 (2 + x)
5x = 6 * 2 + 6 * x
5x = 12 + 6x
5x - 6x = 12
- x = 12
x = - 12
c) 7 + 3 (x - 1) = 8
7 + 3 * x + 3 * (- 1) = 8
7 + 3x - 3 = 8
3x = 8 - 7 + 3
3x = 4
x = 4/3
d) 9 (3 - x) = - 10x
9 * 3 + 9 * (- x) = - 10x
27 - 9x = - 10x
10x - 9x = - 27
x = - 27