bonjour moi j arrive pas cette exercices aider moii svp CALCULE EN DETAILLANT LES ETAPES B:6*[13-(5-2)] C:[(8-2)*8]/4+8 D: [(31-5)-2*7)]/6/2 E: 3.4+[9*(8/2)]/6*

B= 6 - [ 13 - ( 5 - 2 ) ]
5 - 2 = 3 
13 - 3 = 10
13 - 10 = 3
B= 6 - 3 = 3

C= [ ( 8 - 2 ) * 8 ] : 4 + 8
8 - 2 = 6
6 * 8 = 48
48 : 4 = 12 
C = 12 + 8 = 20

D = [ ( 31 - 5 ) - 2 * 7 ] : 6 : 2
31 - 5 = 26
2 * 7 = 14
26 - 14 = 12 
12 : 6 = 2 
2 : 2 = 0

E= 3,4 + [ 9 * ( 8 : 2 ) ] : 6 * 7 + 2.6
8 : 2 = 4
9 * 4 = 36
36 : 6 = 6 
6 * 7 = 42 
E = 3,4 + 42 + 2,6 = 48

F= 21 + 8 *2 ( 2 + ( 13 - 9 ) * 3 ] - ( 10 - 6 )
13 - 9 = 4
4 * 3 = 12
2 + 12 = 14
10 - 6 = 4
8 * 2 = 16 
14 - 4 = 10
F = 21 + 16  - 10 = 27 
F = 21 + 16 + 10 = 47
( je sais pas c'est lequel entre les deux F)

B:6*[13-(5-2)]
=6*(13-3)
=6*10
=60

C:[(8-2)*8]/4+8
=(6*8)/4+8
=48/4+8
=12+8
=20

D: [(31-5)-2*7)]/6/2
=(26-14)*2/6
=12*2/6
=24/6
=12/3
=4

E: 3.4+[9*(8/2)]/6*7+2.6
=3.4+(72/2)/42+2.6
=3.4+36/42+2.6
=3.4+2.6+18/21
=6+6/7
=42/7+6/7
=48/7

F: 21+8*2(2+(13-9)*3]-(10-6)
=21+16*(2+4*3)-4
=21+16*(2+12)-4
=21+16*14-4
=21+224-4
=241