Réponse :
calculer et donner le résultat sous la forme de fraction irréductible
A = (21/26) x (13/7) - 13/7 ordre de priorité la x
= (3 x 7/2 x 13) x 13/7 - 13/7
= 3/2 - 13/7
= 21/14 - 26/14 = - 5/14
B = (2/15 - 1/3)(5/2 + 5/4)
= (2/15 - 5/15)(10/4 + 5/4)
= (-3/15)(15/4)
= - 1/5 x 15/4 = - 15/20 = - 3/4
C = (5/4 - 2/3) ÷ 5/4
= (15/12 - 8/12) ÷ 5/4
= 7/12 ÷ 5/4 = 7 x 4/12 x 5 = 7/15
D = (1 - 11/6)/10/(9 + 5/6)
= (6/6 - 11/6)/(20/18 + 15/18)
= - 5/6 ÷ 35/18 = - 5 x 18/6 x 35 = - 3/7
Explications étape par étape
