bonjour;
5(x-3) + 10
= 5x -15 +10
= 5x -5
12 + 7(x + 1)-2x
= 12+7x+7 -2x
= 5x +19
si :
12 + 7(x - 1)-2x
= 12 +7x -7 -2x
= 5x +5
si
-12 + 7(x + 1)-2x
-12 +7x +7 -2x
et là, c'est vrai !
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bonjour;
5(x-3) + 10
= 5x -15 +10
= 5x -5
12 + 7(x + 1)-2x
= 12+7x+7 -2x
= 5x +19
si :
12 + 7(x - 1)-2x
= 12 +7x -7 -2x
= 5x +5
si
-12 + 7(x + 1)-2x
-12 +7x +7 -2x
= 5x -5
et là, c'est vrai !