Vous pouvez m’aider svp c’est juste la question 1 et 3

Réponse :

1) A = 5/3 - 2/7 = (5*7)/21 - (2*3)/21 = 35/21 - 6/21 = 29/21

B = 2/9 + 9 = 2/9 + 81/9 = 83/9

C = 1/35 + 3/7 = 1/35 + 15/35 = 16/35

D = 2/55 - 3/22 = (2*2)/110 - (3*5)/110 = 4/110 - 15/110 = -11/110 = -1/10

E = 4/15 + 5/6 + 7/10 = (4*2)/30 + (5*5)/30 + (7*3)/30 = (8 + 25 + 21)/30 = 54/30 = 18/10

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3) J = 3/5 : 3/7 = 3/5 * 7/3 = 7/5

K = (21/10) / (14/5) = 21/10 * 5/14 = 3/4

M = 12 : (15/2) = 12 * 2/15 = (4*2)/5 = 8/5.