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Algerie93
@Algerie93
April 2019
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Déterminer la valeur des dans les cas suivants:
a)12+x=5-13 x
b)3 x+7(8-x)+4=60+x
c)7x-8=3x+2
d)5(x-2)+2(1-3x)=7x+12
aidez moi svp merrcii
(entre parenthèse sa x c'est pas une multiplication)
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maudmarine
Verified answer
a)
12 + x = 5 - 13x
x + 13x = 5 - 12
14x = - 7
x = - 7/14
x = - 1/7
b)
3x + 7 (8 - x) + 4 = 60 + x
3x + 56 - 7x + 4 = 60 + x
3x - 7x - x = 60 - 56 - 4
- 5x = 60 - 60
- 5x = 0
x = - 0/5
x = 0
c)
7x - 8 = 3x + 2
7x - 3x = 2 + 8
4x = 10
x = 10/4
x = 2,5
d)
5 (x - 2) + 2 (1 - 3x) = 7x + 12
5x - 10 + 2 - 6x = 7x + 12
5x - 6x - 7x = 12 + 10 - 2
- 8x = 20
x = - 20/8
x = - 2,5
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Verified answer
a)12 + x = 5 - 13x
x + 13x = 5 - 12
14x = - 7
x = - 7/14
x = - 1/7
b)
3x + 7 (8 - x) + 4 = 60 + x
3x + 56 - 7x + 4 = 60 + x
3x - 7x - x = 60 - 56 - 4
- 5x = 60 - 60
- 5x = 0
x = - 0/5
x = 0
c)
7x - 8 = 3x + 2
7x - 3x = 2 + 8
4x = 10
x = 10/4
x = 2,5
d)
5 (x - 2) + 2 (1 - 3x) = 7x + 12
5x - 10 + 2 - 6x = 7x + 12
5x - 6x - 7x = 12 + 10 - 2
- 8x = 20
x = - 20/8
x = - 2,5