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Sweetcookies
@Sweetcookies
May 2019
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Bonjour, je n'arrive pas à résoudre quelques équations merci en avance !
a) 5x-3= 6-3x
b) 7-4x= -3+2x
c) 3(5-2x)=7-4x
d) 3-(2x-4)= x+7
e) 3(2x+7)-4=7-5 (4-3x)
f) 2x (3x-4)+5=3x (2x-5)-4
Voilà pour information les x ne sont pas des fois.
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winner123
Verified answer
Bonjour
a) 5 x - 3 = 6 - 3 x
5 x + 3 x = 6 + 3
8 x = 9
x = 9/8
b) 7 - 4 x = - 3 + 2 x
- 4 x - 2 x = - 3 - 7
- 6 x = - 10
x = 10/6 = 5/3
c) 15 - 6 x = 7 - 4 x
- 6 x + 4 x = 7 - 15
- 2x = - 8
x = 4
d) 3 - 2 x + 4 = x + 7
- 2 x - x = 7 - 3 - 4
- 3 x = 0
x = 0
e) 6 x + 21 - 4 = 7 - 20 + 15 x
6 x - 15 x = 7 - 20 - 21 + 4
- 9 x = - 30
x = 30/9 = 10/3
f) 6 x² - 8 x + 5 = 6 x² - 15 x - 4
6 x² - 6 x² - 8 x + 15 x = - 4 - 5
7 x = - 9
x = - 9/7
1 votes
Thanks 1
Sweetcookies
Merci beaucoup !
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Verified answer
Bonjoura) 5 x - 3 = 6 - 3 x
5 x + 3 x = 6 + 3
8 x = 9
x = 9/8
b) 7 - 4 x = - 3 + 2 x
- 4 x - 2 x = - 3 - 7
- 6 x = - 10
x = 10/6 = 5/3
c) 15 - 6 x = 7 - 4 x
- 6 x + 4 x = 7 - 15
- 2x = - 8
x = 4
d) 3 - 2 x + 4 = x + 7
- 2 x - x = 7 - 3 - 4
- 3 x = 0
x = 0
e) 6 x + 21 - 4 = 7 - 20 + 15 x
6 x - 15 x = 7 - 20 - 21 + 4
- 9 x = - 30
x = 30/9 = 10/3
f) 6 x² - 8 x + 5 = 6 x² - 15 x - 4
6 x² - 6 x² - 8 x + 15 x = - 4 - 5
7 x = - 9
x = - 9/7