Réponses

2014-05-06T19:25:03+02:00
D)
4/5 + 3/5 x 1/2
= 4/5 + 3/10 = 4 x 2 / 5 x 2 + 3/10
= 8/10 + 3/10
= 11/10

E)
18/4 + 8/2 - 1/2
= 18/4 + 8 x 2 / 2 x 2 - 1 x 2 / 2 x 2
= 18/4 + 16/4 - 2/4 = 34/4 - 2/4
= 32/4 = 4 x 8 / 4 x 1
= 8/1
= 8

F) 1/3 x 3/16 x 16/13
= 3/48 x 16/13
= 48/624
= 48 x 1 / 48 x 13
= 1/13