Bonjour, :) j’aurai besoin d’aide en maths svp, merci d’avance
1. (- 2/5) ÷ (1/5) + 1/2 =…..
2. 5/2 - 3/2 ÷ 1/4 =…..
3. 1/5 - (1/2 - 1/4) = ….
4. 1/4 + 2/3 × 3/4 =…..
5. 4 - 12/5 × 10/3 =….
1. (- 2/5) ÷ (1/5) + 1/2 =…..
2. 5/2 - 3/2 ÷ 1/4 =…..
3. 1/5 - (1/2 - 1/4) = ….
4. 1/4 + 2/3 × 3/4 =…..
5. 4 - 12/5 × 10/3 =….
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Réponse :
1) ( -2/5) ÷(1/5) + 1/2 = (-2/5) × (5) + 1/2 = -10/5 + 1/2 = -2 +1/2 = - 3/2
2)5/2 - 3/2 ÷1/4 = 5/2 - 3/2 ×4 = 5/2 - 12/2 = - 7/2
3) 1/5 - ( 1/2 - 1/4) = 1/5 - ( 2 /4 - 1 /4) = 1/5 -( 1/4) = 1/5 -1/4 = 4/20 - 5/20= - 1/20
4)1/4 + 2/3 × 3/4 = 1/4 + 2/4 = 3/4
5) 4 - 12/5 × 10/3 = 4- 12/5 × 2×5/3 =4 - 24/3 = 4- 8 = -4
Explications étape par étape :