Mathématiques
Deg27
1

j'ai besoin de l'aide pour l'excercice 3 merci beaucoup

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(1) Réponses
michous

Bonjour, A = 7/9 - 56/12 A = 7 x 4 / 9 x 4 - 56 x 3 / 12 x 3 A = 28/36 - 168/36 A = - 140/36 A = 4 x - 35 / 4 x 9 A = - 35/9 B = 25/16 x - 12/15 B = - 300/240 B = 60 x - 5 / 60 x 4 B = - 5/4 C = (4/5 - 11/3) x 25/43 C = (4 x 3 / 5 x 3 - 11 x 5 / 3 x 5) x 25/43 C = (12/15 - 55/15) x 25/43 C = - 43/15 x 25/43 C = - 1075/645 C = 215 x - 5 / 215 x 3 C = - 5/3 D = 3/8 x - 2/5 - 3/5 x - 7/4 D = - 6/40 + 21/20 D = 2 x - 3 / 2 x 20 + 21/20 D = - 3/20 + 21/20 D = 18/20 D = 2 x 9 / 2 x 10 D = 9/10

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