Bonjour,
1)
5x-7 = 23
5x= 23 +7
5x= 30
x= 30/5 = 6
2)
3x -50 = -2
3x= 50-2
3x = 48
x = 48/3 = 16
3)
x/4 + 7 = 22
x/4 = 22-7
x/4 =15
x= 15*4 = 60
4) (x+20 )4 = 20x
4x+80 = 20x
80 = 20x-4x
80 = 16x
x= 80/16=5
5)
2x +8 =0
2x= -8
x= -8/2 = -4
Réponse :
1/ 5x - 7 = 23
5x = 23 +7
5x = 30
x = 30/5
x = 6
le nombre est 6
2/ 3x - 50 = -2
3x = -2 +50
x = 48/3
x = 16
le nombre est 16
3/ x/4 + 7 = 22
x/4 = 22 - 7
x/4 = 15
x/4 × 4 = 15×4
x = 60
le nombre est 60
4/ (x + 20)×4 = 20x
4x +80 = 20x
80 = 20x - 4x
x = 80/16
x = 5
le nombre est 5
5/ 2x + 8 = 0
2x = -8
x = -8/2
x = -4
le nombre est -4
voila:)
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Bonjour,
1)
5x-7 = 23
5x= 23 +7
5x= 30
x= 30/5 = 6
2)
3x -50 = -2
3x= 50-2
3x = 48
x = 48/3 = 16
3)
x/4 + 7 = 22
x/4 = 22-7
x/4 =15
x= 15*4 = 60
4) (x+20 )4 = 20x
4x+80 = 20x
80 = 20x-4x
80 = 16x
x= 80/16=5
5)
2x +8 =0
2x= -8
x= -8/2 = -4
Réponse :
1/ 5x - 7 = 23
5x = 23 +7
5x = 30
x = 30/5
x = 6
le nombre est 6
2/ 3x - 50 = -2
3x = -2 +50
3x = 48
x = 48/3
x = 16
le nombre est 16
3/ x/4 + 7 = 22
x/4 = 22 - 7
x/4 = 15
x/4 × 4 = 15×4
x = 60
le nombre est 60
4/ (x + 20)×4 = 20x
4x +80 = 20x
80 = 20x - 4x
80 = 16x
x = 80/16
x = 5
le nombre est 5
5/ 2x + 8 = 0
2x = -8
x = -8/2
x = -4
le nombre est -4
voila:)