Réponses

2013-05-23T19:31:39+02:00
(4/5 -1/3) x ( 2/15 + 4/15)
= (12/15-5/15)x(6/15)
=7/15x6/15
=42/225

4/5-1/3x2/15+4/15
4/5-2/45+4/15
36/45-2/45+12/45
46/45
2013-05-23T19:32:24+02:00

C = 4*3/5*3 - 1*5/3*5) * 6/15 = (12/15 - 5/15) * 6/15 = 7/15 * 6/15 = 14/75

 

D = 7/15 * 2/15 + 4/15 = 14/225 + 4/15 = 14/225 + 4*25/15*15 = 14/225 + 100/225 = 114/225