Sagot :
a) 2x+5=15-3x
2x+3x=15-3x+3x
5x=15
5x/5=15/5
x=3
b)-6x+4=-1-x
-6x+6x+4=1-x+6x
4+1=-1+1+-x+6x
5=5x
5/5=5x/5
x=1
c)7m+10=m-8
7m+10-10=m-8-10
7m=m-(-2)
7m-m=m-m-(-2)
6m=-2
6m/6=-2/6
x=-2/6
d)-12y=4-13y
12y+13y=4-13y+13y
25y=4
25/25=4/25
y=0,16
Voilà j'espère que je n'ai pas fais trop d'érreur et que je t'ai aidé :)
Bonjour,
[tex]2x+5 = 15-3x\\ 2x+3x+5 = 15-3x+3x\\ 5x+5 = 15\\ 5x+5-5 = 15-5\\ 5x = 10\\ x = \frac{10}{5} = 2\\ \\ -6x+4 = -1-x\\ -6x+x+4 = -1-x+x\\ -5x+4 = -1\\ -5x+4-4 = -1-4\\ -5x = -5\\ x = \frac{-5}{-5} = 1\\ \\ 7m+10 = m-8\\ 7m-m+10 = m-m-8\\ 6m+10 = -8\\ 6m+10-10 = -8-10\\ 6m = -18\\ m = \frac{-18}{6} = -3\\ \\ -12y = 4-13y\\ -12y+13y = 4-13y+13y\\ y = 4[/tex]