1) 5 4/10*3 3/7+1 15/10: 7/25-1 2/3 2)(4 3/10-3 3/5*5/12)*5/6 3)(5/24+5/16)*(1 2/3-3/5)*1 4/5

 1) 54/10*24/7+25/10:725-5/3=(54/10*24/7)+(25/10:7/25)-5/3=(648/36+125/14)-5/3=3842/140-5/3=28 1/137
2)  (43/10-18/5*5/12)*5/6=(25/5*5/12)*5/6=25/12*5/6=125/72=1 53/72
3) (5/24+5/16)*(1 2/3-3/5)*1 4/5=(25/48*14/5)=35/24=1 11/24