Exercice 2 : En précisant les étapes de calcul,
1. Calculer et simplifier le plus possible : C = 1/5 + 3/5 ÷ 4 ; D= (3/5 - 1/2) x 5/2 ; E = 5/6 - 5/4 ÷ 5/8
2. donnez l'écriture scientifique de : F = 37 x 10-³ x 5 x 10-¹ ÷ 4 x 10-⁶
3. calculer : G = 3-² - 3-²
svpp merci !!!!!​
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