Sagot :
a) 12-5=-x-13x
7=-14x
x=-7/14
x=-1/2
b) 7x-3x=8+2
4x=10
x=10/4
x=5/2
c) 3x/2- x/4 = -1-1
(2*3)x/(2*2) - x/4 = -2
6x/4 - x/4 =-2
5x/4 =-2
5x = -2*4
x = -8/5
7=-14x
x=-7/14
x=-1/2
b) 7x-3x=8+2
4x=10
x=10/4
x=5/2
c) 3x/2- x/4 = -1-1
(2*3)x/(2*2) - x/4 = -2
6x/4 - x/4 =-2
5x/4 =-2
5x = -2*4
x = -8/5
Réponse :
bonjour
Explications étape par étape :
A=12+x=5−13x
A=12+x+13x=5
A=12+14x=5
A=14x=5−12
A=14x=−7
A=x= −7/14
A=x=− 1/2
B=7x-8 = 3x +2
B=7x−8−3x=2
B=4x−8=2
B=4x=2+8
B=4x=10
B=x= 10/4
B=x= 2/5
C=3÷2x+1=x÷4−1
C=6x+4=x−4
C=6x+4−x=−4
C=5x+4=−4
C=5x=−4−4
C=5x=−8
C=x= −8/5
x=− 8/5