Réponses

2014-05-14T18:56:03+02:00

A= 3/4 - 1/2

= 3/4 - 1 × 2/2 × 2

= 3/4 - 2/4

= 3 - 2/4

= 1/4


B= 4/3 - 7/6

= 7/6 - 4 × 2/3 × 2

= 8/6 - 7/6

= 8 - 7/6

= 1/6


C= 4/5 - 13/20

= 13/20 - 4 × 4/5 × 4

= 16/20 - 13/20

= 16 - 13/20

= 3/20


D= 35/16 - 7/4

= 35/16 - 7 × 4/4 × 4

= 35/16 - 28/16

= 35 - 28/16

= 7/16


E= 35/49 - 3/7

= 35/49 - 3 × 7/7 × 7

= 35/49 - 21/49

= 35 - 21/49

= 14/49


F= 32/56 - 4/7

= 32/56 - 4 × 8/7 × 8

= 32/56 - 32/56

= 32 - 32/56

= 0/56 ou 0 mais choisi plutôt le 0