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Sagot :

Réponse :

exo 4 :

a) x = 4/3*2 = 8/3

b) 3x = 4/7*5 = 20/7

donc x = (20/7)/3 = 20/7*1/3 = 20/21

c) 5a = 3/2*4 = 10

donc a = 10/5 = 2

d) 3/2x = 5/6+1/2 = 4/3

donc x = (4/3) / (3/2) 4/3*2/3 = 8/9

e) 5/2x-5/4x = 4/3

5/4x = 4/3

donc x = (4/3) / (5/4) = 4/3*4/5 = 16/15

Explications étape par étape

VINS

bonjour

x/2 = 4/3

3 x = 8

x = 8/3

3 x /5 = 4 /7

21 x = 20

x = 20/21

5 a /4 = 3/2

10 a = 12

a =  6/ 5

3 x /2 - 1 /2  = 5 /6

9 x /6 -  3/6 = 5 /6

9 x = 5 + 3

9 x = 8

x = 8/9

5 x /2 = 5 x /4 + 4/3

30 x /12 = 15 x /12 + 16/12

30 x  - 15 x = 16

15 x = 16

x = 16/15

x + 2 x - 3 + x - 7 = 1 2

4 x = 12 + 3 + 7

4 x = 22

x = 22/4 = 11/2

20 x - 28 = 32

20 x = 32 + 28

20 x = 60

x =  3

5 x + 5 - 3 x + 6 = 48

2 x = 48 - 5 - 6

2 x =  37

x = 37/2

continue

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