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Lina33
@Lina33
April 2019
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Question a et question b
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5 - 4(3 - 2x) = - 2
5 - 12 + 8x = - 2
8x = - 2 - 5 + 12
8x = 5
x = 5/8
S= {5/8}
2 + (- 3)/(1 - 5x) = 4
avec x ≠ 1/5
2 + (- 3)/(1 - 5x) - 4 = 0
- 2 - 3/(1 - 5x) = 0
- 2 + 3/(5x - 1) = 0
- [2(5x - 1)]/(5x - 1) + 3/(5x - 1) = 0
(- 10x + 2 + 3)/(5x - 1) = 0
- (10x - 5)/(5x - 1) = 0
un quotient est nul si son numérateur est nul.
10x - 5 = 0
10x = 5
x = 5/10
x = 1/2
S= {1/2}
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Lina33
merci
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5 - 12 + 8x = - 2
8x = - 2 - 5 + 12
8x = 5
x = 5/8
S= {5/8}
2 + (- 3)/(1 - 5x) = 4 avec x ≠ 1/5
2 + (- 3)/(1 - 5x) - 4 = 0
- 2 - 3/(1 - 5x) = 0
- 2 + 3/(5x - 1) = 0
- [2(5x - 1)]/(5x - 1) + 3/(5x - 1) = 0
(- 10x + 2 + 3)/(5x - 1) = 0
- (10x - 5)/(5x - 1) = 0 un quotient est nul si son numérateur est nul.
10x - 5 = 0
10x = 5
x = 5/10
x = 1/2
S= {1/2}