Explicație pas cu pas:
La fiecare exercițiu scoți de sub radical
deci:
a) 1/4:(2/9+7/6-3/12)=1/4:(8/36+42/36-9/36)=1/4:41/36=1/4×36/41=9/41
ps: in paranteză am amplificat fractiile cu 4, 6, 3.
b) 1/8:(10/3-5/4-3/8)=1/8:(80/24-30/24-9/24)=1/8:41/24=1/8×24/41=4/41
c) (15/9-11/6-7/4):1/6=(60/36-66/36-63/36):1/6=-69/36×6/1=-69/6
d) (13/20-9/10+8/5):1/5=(13/20-18/20+32/20):1/5=27/20×5/1=27/4.
