Répondre :
A= -5 /3 x 8/21
= -40/ 63
B= (9/12 - 10/12) x 3/2
=-(1/12) x 3/2
= 3/24
C=11/1 : (4/6 - 15/6)
=11/1 : (-11/6)
=11/1 x 6/ -11
= 66/-11
D=3/7 - (15/7 x 24/5)
= 3/7 - ( 360 /35)
= 15/ 35 - 360/35
=-345/35
E= (55/35 - 14/35) x 24/7
= 41/35 x 35/7
= 1435/245
= -40/ 63
B= (9/12 - 10/12) x 3/2
=-(1/12) x 3/2
= 3/24
C=11/1 : (4/6 - 15/6)
=11/1 : (-11/6)
=11/1 x 6/ -11
= 66/-11
D=3/7 - (15/7 x 24/5)
= 3/7 - ( 360 /35)
= 15/ 35 - 360/35
=-345/35
E= (55/35 - 14/35) x 24/7
= 41/35 x 35/7
= 1435/245