Sagot :
Réponse:
A)
on a 5x-85-10=0
5x-95=0
5x=95
x=95/5
x=19
B)
on a 4x-7=2x+13
4x-2x=13+7
2x=20
x=20/2
x=10
C)
on a -7x+8=-4x+12
-7x+4x=12-8
-3x=4
x=-4/3
D)
on a (7x-8)-(3x-20)=0
7x-8-3x+20=0
4x=-12
x=-12/4
x=-3
Réponse:
A)
on a 5x-85-10=0
5x-95=0
5x=95
x=95/5
x=19
B)
on a 4x-7=2x+13
4x-2x=13+7
2x=20
x=20/2
x=10
C)
on a -7x+8=-4x+12
-7x+4x=12-8
-3x=4
x=-4/3
D)
on a (7x-8)-(3x-20)=0
7x-8-3x+20=0
4x=-12
x=-12/4
x=-3