(30 4/5 + 27,4) *0,9 / (31,64 - 12 6/25) *

1 2 4 3 5
(30 4/5+27,4)*0,9/(31,64-12 6/25)*1,2=58,2*0,9/19,4*1,2=52,38/19,4*1,2=2,7*1,2=3,24.
1)30 4/5+27,4=(30*5+4)/5+27,4=154/5+27,4=30,8+27,4=58,2;
2)58,2*0,9=52,38;
3)31,64-12 6/25=31,64-(25*12+6)/25=31,64-306/25=31,64-12,24=19,4;
4)52,38/19,4=2,7;
5)2,7*1,2=3,24.