quelqu'un pourrait il m'aider svp exo 2et 3 svp.... Pergunta de ideia dekhedoushka

anylor Bonsoir

exercice 2

a)
5x-25 =0
5x = 25
x =25/5
x=5

b)
3x+1=7
3x =7-1
3x=6
x=6/3
x=2

c)
7x+13=-2
7x= -13-2
7x=-15
x=-15/7

d)
4x-3 =0
4x=3
x=3/4

e)
4-3x =11
4-11 =3x
3x = -7
x = -7/3

f)
5-x =7
5-7 = x
x=-2

exercice 3
a)
3x=2x+5
3x-2x=5
x=5

b)
4-5x=9x
4= 9x+5x
14x =4
x =4/14
x= 2/7

c)
4x+2 = x+11
4x-x = 11-2
3x = 9
x =9/3
x =3

d)
3x-7 = -2x-9
3x+2x = -9 +7
5x = -2
x= -2/5

e)
5x -1 = 7x -1
-1+1 = 7x -5x
2x = 0
x = 0

f)
3x-2+x = 6+4x
4x -4x = 6 +2
0x = 8
impossible
pas de solution

1 votes Thanks 1

khedoushka merci bcp :-)

anylor de rien;)

cyrielleduc Ex 2 A) 5x - 25 - 25 = 0 - 25 5x = -25 5x : 5 = -25 : 5 1x = -5 B) 3x + 1 - 1 = 7 - 1 3x = 6 3x : 3 = 6 : 3 1x = 2 C) 7x + 13 - 13 = -2 - 13 7x = -15 7x : 7 = -15 : 7 1x = -15/7 D) 4x - 3 + 3 = 0 + 3 4x = 3 4x : 4 = 3 : 4 1x = 0,75 E) 4 - 3x - 4 = 11 - 4 3x = 7 3x : 3 = 7 : 3 1x = -7/3 F) 5 - x - 5 = 7 - 5 x = 2 Ex 3 A) 3x - 2x = 2x + 5 - 2x 1x = 5 B) 4 - 5x + 5x = 9x + 5x 4 = 15x 4 : 15 = 15x : 15 4/15 = 1x C) 4x + 2 - 1x = x + 11 - 1x 3x + 2 - 2 = 11 - 2 3x = 9 3x : 3 = 9 : 3 1x = 3 D) 3x - 7 + 7 = -2x - 9 + 7 3x + 2x = -2x - 2 + 2x 5x = -2 5x : 5 = -2 : 5 1x = -0,4 E) 5x - 1 - 5x = 7x - 1 - 5x 1 = 2x 1 : 2 = 2x : 2 0,5 = 1x F) Je sais pas

0 votes Thanks 1

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Bonsoir est-ce que quelqu'un peut m'aider svp exercice 19 et 23 svp

Anylor aide moi stp, exo 12, le 11 laisse tomber je viens de le faire donc fait juste le 12 stp

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