Cevap:
Yukarıdan aşağı dopru
-2/3+4/3:7/3=2/3:7/3=2/3*3/7=2/7
(7/4:5/2):14/11=7/10*11/14=11/20
(-2/3)*(-1/2:5/2)=(-2/3)*(-1/5)=2/15
1:(1/6-5/6)=1:(-4/6)=1*-6/4=-6/4=-3/2
