Website Statistics Bonjour pouvezvous maider acec ces exercices Merci résoudre 3x42x9 5x94x13 8x21x42 x514

Répondre :

Marouane0

Réponse :

-3x-4=2x+9 <=> -5x = 13 <=> x = -13/5
5x+9=4x-13 <=> x = -22
8x-21=x-42 <=> 7x = -21 <=> x = -21/7 = -3
x/5-1=4​ <=> x-5=4*5=20 <=> x= 25

hirondelle52

Bonjour;

-3x-4=2x+9

-4-9 = 2x+3x

-13 = 5x

x = -13/5

x = 2,6

5x+9=4x-13

5x -4x = -13 -9

x = -22

8x-21=x-42

8x -x = -42 +21

7x = -21

x = -21/7

x = -3

x/5-1=4​

x/5 = 4+1

x/5 = 5

x= 5*5

x = 25

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