Răspuns:
1) (4/9*2/3+14/3)*9/40=(8/27+14/3)*9/40=(8/27+126/27)*9/40=134/27*9/40=134/120=67/60
2) (4/5-8/15:3/4)*15/18=(4/5-8/15*4/3)*5/6=(4/5-32/45)*5/6=(36/45-32/45)*5/6=4/45*5/6=4/54
3) 14/15*(7/4+27/8:2/9)=14/15*(7/4+27/8*9/2)=14/15*(7/4+243/16)=14/15*(28/16+243/16)=14/15*271/16=7/15*271/8= 1897/120
