A = 7/5 + 3/8
= 56/40 + 15/40
= 61/40
B = - 7/25 : - 14/5
= - 7/25 * - 5/14
= 35/ 350 = 1/10
C = 4/9 * 1/4 + 3 /9
= 4 /36 + 12/36*
= 16/36 = 4 /9
D = 7/3 - 5/3 : 15/2
= 7/3 - 5/3 * 2/15
= 7/3 - 10 /45
= 105/45 - 10/45
= 95/45 = 19/9
E = ( 5/2 - 5/4 ) : ( 2/7 + 1/4 )
= ( 10 /4 - 5/4 ) : ( 8/28 + 7/28)
= 5 /4 : 15/28
= 5/4 * 28/15
= 140/60 = 7 /2
1/4 + 1/5 = 5/20 + 4/20 = 9 /20
fanny et Benoît ont mangé les 9 /20
il reste = 11/20
pauline mange : 11/20 * 3/4 = 33/80
1/4 = 20/80
1/5 = 16/80
c'est Pauline qui en a mangé le plus
68 000 x 13/40 = 22 100
22 100 tonnes en PACA
45 900 tonnes ailleurs
