720/2592+1512/2592=2232/2592=558/648=186/216=31/36
126/432+120/432=246/432=41/72
(15*9+8)/15-(4*12+1)/12+(3*20+7)/20=142/15-49/12+67/20=1704/180-735/180+67/20=969/180+67/20=323/60+201/60=524/60=131/15=8целых 11/15
11/6+(3-17/10)=11/6+13/10=110/60+78/60=188/60=47/15=3+2/15