Bonsoir :) urgent svp 15 point merci d'avance exercice 1 et 2.

Exo 1

A) 7/15 - 2/15 x 9/4
= 7/15 - 18/60
= 14/30 - 9/30
= 5/30 = 1/6

B) = 8 x 8^26 / 8^30 x 8^-7
= 8^27 / 8^23
= 8^-4

C) 927 / 486-13x8
= 927 / 486-104
= 927 / 382
~ 2.42