Réponses

Meilleure réponse !
2014-09-09T09:34:43+02:00
A=(1-1/7):12/5=(7/7-1/7)*5/12=6/7*5/12=1/7*5/2=5/14

B=(1/4-1/5)*(7+37/9)=(5/20-4/20)*(63/9+37/9)=1/20*100/9=5/9

C=(2/3+1/6)/(2-1/2)=(4/6+1/6)/(4/2-1/2)=(5/6)/(3/2)=5/6*2/3=5/9

D=3/4+1/2*(2/3-1)=3/4+1/2*(2/3-3/3)=3/4-1/2*1/3=3/4-1/6=9/12-2/12=7/12