Réponses

2012-10-25T17:54:31+02:00

7/2-2/3=(7*3)/(2*3)-(2*2)/(3*2)=21/6-4/6=17/6

2/3+7/12=(2*4)/(3*4)+7/12=8/12+7/12=15/12=(3*5)/3*4)=5/4

-5/4-5/16=-(5*4)/(4*4)-5/16=-20/16-5/16=-25/16=-(5/4)²

25/42+-3/7=25/42-(3*6)/(7*6)=25/42-18/42=7/42=(7*1)/(7*6)=1/6

2012-10-25T17:55:52+02:00

7/6-4/6=3/6

32/48+28/48-60/48-15/48=-15/48

25/42-18/42=7/42=1/6