Bonjour j’ai besoin d’aide pour cette exercice ( dm) svp.

Bonjour

A = 2/3 + 3/5

A = (2 x 5) / (3 x 5) + (3 x 3) / (5 x 3)

A = 10/15 + 9/15

A = 19/15

B = 3/2 - 2/3 x 5/3

B = 3/2 - 10/9

B = (3 x 9) / (2 x 9) - (10 x 2) / (9 x 2)

B = 27/18 - 20/18

B = 7/18

C = 15/39 x 26/25 x 28/42

C = 10 920/40 950

C = (2 730 x 30) / (2 730 x 15)

C = 30/15

D = (3 + 5/4) : (5 - 2/7)

D = [(3 x 4) / (1 x 4) + 5/4] : [(5 x 7) / (1 x 7) - 2/7]

D = (12/4 + 5/4) : (35/7 - 2/7)

D = 17/4 : 33/7

D = 17/4 x 7/33

D = 119/132