Réponses

2014-02-09T15:31:30+01:00
On donne a=6 sur 7et b=4sur7
Calculer:
a) a+b    = 6/7 + 4/7 = 10/7
 b) a-b   = 6/7 -4/7 = 3/7
 c) ab = 6/7 *4/7 =24 / 49

On donne a= 5sur3 et b= 10 sur 21
Calculer:
a) a+b  = 5/3 +10/21 = 5*7/3*7 + 10/21 = 35/21 +10/21 = 45/21

b) a-b   = 5/3 -10/21 = 35/21 -10/21 = 25/21

c) ab  5/3 * 10/21  = 50 /63