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Sagot :

Bonsoir,

27

a)

9+3 = 2a

12 = 2a

a= 12/2

a= 6

b)

4t+2t = -3

6t = -3

t = -3/6

t = -1/2

28

a)

5x= -3

x = -3/5

b)

7y = 5

y = 5/7

MARIEJOE57

Réponse :

bonjour

Explications étape par étape :

9-2x=-3

-2x=-3-9

-2a=-12

a=-12/-2

a=6

4t+3=-2t

4t+2t=-3

6t= -3

t= -3/6

t= -1/2

5x+3=0

5x=-3

x= -3/5

-7y+5=0

-7y = -5

y= -5/-7

y =5/7

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