Réponses

2014-05-05T19:11:56+02:00
Salut :)

A = -5/12 + 1/14
A = -35/84 + 6/84
A = -29/84

B = -20/21 × -14/-15
B = -5x4x7x(-2)/7x3x(-5)x3
B = -8/9

C = 21/8 ÷ 3/7

C = 21/8 x 7/3
C = 7x3x7/8x3
C = 49/8

J'espère t'avoir aidé(e) ! :)