Réponses

2013-05-12T13:51:42+02:00

1) 1/2 +14/15 : 2/3

 = 15/30 + 28/30 : 2/3

  = 43/30 : 2/3

= 43/30 x 3/2 = 129/60 = 43/20

 

 

2) (1/4+2/3 x 9/10) : 3/10

= (1/4 + 18/30) : 3/10

= 15/60 + 36/60 : 3/10

= 51/60 x 10/3

= 510/180

= 51/18

 

3) [(-2+1) x (-5)+4] - (-3)

= 5+4+3 = 12