Répondre :
Réponse :
a)6 b)2 c)3/7 d)15 e)-2/3 f)-16/5
Explications étape par étape :
a=2x+1=13
2x+1-1=13-1
2x=12
x=12:2
x=6
b) 14=20-3x
14-20=20-3x-20
-6=-3x
3x=6
x=6:3
X=2
c)2x+1/7=1
2x-1/7+1/7=1-1/7
2x=6/7
X=6/7/2
X=3/7
D) 3x-5=2x+10
1x-5=10
X=15
E)10x+3=7x-1
3x+3=1
3x=-2
X=-2/3
F)3x=8x+16
-5x=16
X=-16/5
Bonjour;
a)
2x= 13-1
2x = 12
x=12/2
x= 6
b)
3x = 20-14
3x = 6
x= 6/3
x = 2
c)
2x= 1-1/7
2x = 7/7-1/7
2x = 6/7
x = (6/7)/2
x = 6/7*1/2
x = 6/14
x= 3/7
d)
3x-2x = 10 +5
x = 15
e)
10x-7x = -1-3
3x = -4
x= -3/4
x= -0,75
f)
-16 = 8x-3x
-16 = 5x
x = -16/5
x = -3,2