Bonjour,

6x + 12 = 3 ( 2x + 4 ) = 7x + 5 - ( x - 7 ) = 6 ( x + 2 ) = x + 5 ( x + 2 ) + 2

3 ( 2x + 4 ) = 6x + 12

7x + 5 - ( x - 7 ) = 7x + 5 - x + 7 = 6x + 12

6 ( x + 2 ) = 6x + 12

x + 5 ( x + 2 ) + 2 = x + 5x + 10 + 2 = 6x + 12

Si on remplace x par 5,

6*5 + 12 = 30 + 12 = 42

3 ( 2*5 + 4 ) = 3 ( 10 + 4 ) = 30 + 12 = 42

7*5 + 5 - ( 5 - 7 ) = 35 + 5 - (-2) = 40 + 2 = 42

6 ( 5 + 2 ) = 30 + 12 = 42

5 + 5 ( 5 + 2 ) + 2 = 5 + 25 + 10 + 2 = 30 + 10 + 2 = 40 + 2 = 42

6x + 4 = 2 ( 2 + 3x )

2 ( 2 + 3x ) = 4 + 6x

Si on remplace x par 5,

6*5 + 4 = 30 + 4 = 34

2 ( 2 + 3*5 ) = 2 ( 2 + 15 ) = 4 + 30 = 34

L'expression 5x + 7 n'a pas d'égale