Réponses

2014-02-06T20:41:23+01:00
A=7/5-33/10=(7×2-33)/10=(14-33)/10=-19/10
B=9/4÷3/8= 9/4×8/3= 72/12=6
C= -12/10×7/-20×25/6= 2/2×7/4=7/4
D=(1/4-1/3)÷(1/-1/3)= (3-4)/12÷(3-2)/6= -1/12÷ -(1/6)= 1/12×6= 1/2