Răspuns:
a) [5/18+7/9]:19/5+25/9=(5/18+14/18)*5/19+25/9=19/18*5/19+25/9=5/18+25/9=55/18
c)8*[10/3-(11/15-4/6)]=8*(10/3-11/15+4/6)=8*(100/30-22/30+20/30)=8*98/30=392/15
Explicație pas cu pas: