(30 4/5 + 27,4) *0,9 / (31,64 - 12 6/25) * 1,2.
1. 30,8+27,4=58,2 2, 31,64-12,24=19,4 3. 58,2*0,9=52,38 4. 19,4*1,2=23,28 5. 52,38/23,28=2,25