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Sagot :

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

NBA10

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:)

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