Выполнить действие 4.58-91.259+1.936:3.1/5)*1.16/19+3*5/51=

4,58 - (1,259 + 1,936 / 3 1/5) * 1 16/19 + 3 * 5/51 / (4 5/34 - 3 19/51) = 1 39481/75050 либо 1,52.
  3 1/5 = (3 * 5 + 1)/5 = 16/5.
  1 16/19 = (1 * 19 + 16)/19 = 35/19.
  4 5/34 = (4 * 34 + 5)/34 = 141/34.
  3 19/51 = (3 * 51 + 19)/51 = 172/51.
  1,936 = 1 936/1000 = 1936/1000 сократим на 8 = 242/125.
  1,259 = 1 259/1000 = 1259/1000.
  4,58 = 4 58/100 = (4 * 100 + 58)/100 = 458/100 сократим на 2 = 229/50.

1. 242/125 / 16/5 = (242 * 5)/(125 * 16) = 1210/2000 сократим на 10 = 121/200.
2. 1259/1000 + 121/200 = (1259 + 605)/1000 = 1864/1000 сократим на 8 = 233/125.
3. 233/125 * 35/19 = (233 * 35)/(125 * 19) = 8155/2375 сократим на 5 = 1631/475.
4. 3 * 5/51 = 15/51 сократим на 3 = 5/17.
5. 141/34 - 172/51 = (423 - 344)/102 = 79/102.
6. 5/17 / 79/102 = (5 * 102)/(17 * 79) = 510/1343 сократим на 17 = 30/79.
7. 229/50 - 1631/475 = (4351 - 3262)/950 = 1089/950.
8. 1089/950 + 30/79 = (86031 + 28500)/75050 = 114531/75050 = 1 39481/75050 или 1,52.