Réponses

2013-09-10T09:38:37+02:00
85/4+25/-5 = 85/4 - 5 = 85/4 - 20/4 = 65/4

- 14/27+-5/108 = - 56 / 108  - 5/108 = - 61 / 108

-9/-18 - 5/30+(- 9/6) = + 3/6 -  1/6  -  9/6  = - 7/6