Réponses

2012-10-13T15:50:02+02:00

A= 3/10 + 2/15

= 9/30 + 4/30

= 13/30

 

B= 9/14 - 4/7

= 9/14 - 8/14

= 1/14

 

C= 6/5 x 15/14

= 6 x 3/14

= 2 x 9 / (2 x 7)

= 9/7

 

D= 21/10 Diviser 14/3

= 21/10 x 3/14

= 3x7x3/(10x2x7)

= 9/20

 

en espérant t'avoir aidé.