Réponses

2013-12-02T19:22:05+01:00
(2/3 * -2/5 + 3/2 ) = 2.46666666667 ...

Fais pareil en remplaçant 2/3 par l'autre ;)
2013-12-02T19:23:58+01:00
(2/3)*(-2/5) = -4/15
(-4/15)+(3/2) = (-8/30)+(45/30) = 37/30
(37/30)*2 = 74/30

(-5/6)*(-2/5) = (10/30) = (1/3)
(1/3)+(3/2) = (2/6)+(9/6) = 11/6
(11/6)*2 = 22/6 = 11/3