1) 1 30/37 = 37/37 + 30/37 = 67/373 7/37 = 111/37 + 7/37 = 118/37
67/37 + 2,5 + 118/37 = 67/37 + 2,5 + 118/37 = 67/37 + 2,5 + 118/37 = 3 + 2,5 + 3 = 8,5
Ответ: 8,5
2) 1 7/25 = 25/25 + 7/25 = 32/2532/25 + 8/9 = (329 + 258) / (259) = 388/225388/225 - 7/25 = (38825 - 7225) / (22525) = 9650/5625
Ответ: 9650/5625
3) 14/299 - 2/3 = (143 - 2299) / (2993) = (42 - 598) / 897 = -556 / 89715/29 + (-556/897) = (15897 + 29(-556)) / (29897) = (13455 - 16124) / 26013 = -2669 / 26013
Ответ: -2669/26013
4) 8 4/15 = 120/15 + 4/15 = 124/15124/15 + 11/20 = (12420 + 1115) / (1520) = 2480/300 + 165/300 = 2645/3002645/300 - 4/15 = (2645 - 420) / 300 = 2565/300 = 25/3
Ответ: 25/3
1) 1 30/37 = 37/37 + 30/37 = 67/37
3 7/37 = 111/37 + 7/37 = 118/37
67/37 + 2,5 + 118/37 = 67/37 + 2,5 + 118/37 = 67/37 + 2,5 + 118/37 = 3 + 2,5 + 3 = 8,5
Ответ: 8,5
2) 1 7/25 = 25/25 + 7/25 = 32/25
32/25 + 8/9 = (329 + 258) / (259) = 388/225
388/225 - 7/25 = (38825 - 7225) / (22525) = 9650/5625
Ответ: 9650/5625
3) 14/299 - 2/3 = (143 - 2299) / (2993) = (42 - 598) / 897 = -556 / 897
15/29 + (-556/897) = (15897 + 29(-556)) / (29897) = (13455 - 16124) / 26013 = -2669 / 26013
Ответ: -2669/26013
4) 8 4/15 = 120/15 + 4/15 = 124/15
124/15 + 11/20 = (12420 + 1115) / (1520) = 2480/300 + 165/300 = 2645/300
2645/300 - 4/15 = (2645 - 420) / 300 = 2565/300 = 25/3
Ответ: 25/3