7 u 4/5 * 3/5 = 39/5 * 3/5 = 117/25
2 u 4/5 : 8 u 3/4 = 14/5 : 35/4 = 14/5 * 4/35 = 2/5 * 4/5 = 8/25
117/25 + 8/25 = 125/25 = 5
0,18 : 1,5 = 18/100 : 15/10 = 18/100 * 10/15 = 18/10 * 1/15 = 3/10 * 1/5 = 3/50
3/50 + 2,88 = 0,06 + 2,88 = 2,94
5 : 2,94 = 5 : 294/100 = 5 * 100/294 = 500/294 = 250/147
Ответ: 250/147