Réponse:
À = 81/9*5-1. 81/9 = 9/1=9
= 9*5-1
= 45-1
= 44
B =45/2*3-1. 2*3-1 = 6-1 = 5
= 45/5
= 9
C= 27/2*3 - 1
= 27/6 - 1/1
= 4,5 - 1
= 3,5
D = 17 - 5/3 + 2
= 12 /3 +2/1
= 12 +2 / 3+1
= 14/4
E = 7* 15*4/3-2+2*8
= 7*60/1 + 2*8
= 7*60+16
= 436
F = 13+5/13-(2*4)
= 18/13-8
=18/5
= 3,6
