Réponse :
Exercice 1 :
1. 3*7+2x cm
12 -2x cm
3x-2 cm
2. 31cm
2cm
13 cm
Exercice 2 :
1. (1+1)²-1 = 2²-1 = 3
2. (2+1)²-2 = 3²-2 = 7
3. (x+1)²-x
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Réponse :
Exercice 1 :
1. 3*7+2x cm
12 -2x cm
3x-2 cm
2. 31cm
2cm
13 cm
Exercice 2 :
1. (1+1)²-1 = 2²-1 = 3
2. (2+1)²-2 = 3²-2 = 7
3. (x+1)²-x