Ответ:
(3 4/25+20,24)*2,15+(5,1625-2 3/16)*2/5 = 51,3052
1) 3 4/25 + 20,24 = 3 4/25 + 20 24/100 = 3 16/100 + 20 24/100 = 23 40/100 = 23 4/10 = 23 2/5
2) 5,1635 - 2 3/16 = 5 1635/10000 - 2 3/16 = 5 327/2000 - 2 3/16 = 5 327/2000 - 2 375/2000 = 2 1952/2000 = 2 488/1000 = 2 122/250 = 2 61/125
3) 23 2/5 * 2,15 = 23,4 * 2,15 = 50,31
4) 2 61/125 * 2/5 = 2 61/125 * 0,4 = 2,488 * 0,4 = 0,9952
5) 50,31 + 0,9952 = 50,3100 + 0.9953 = 51,3052