1.
7 19/22 + 15 25/33 = 7 57/66 + 15 50/66 = 22 107/66 = 23 41/66,
75 8/35 - 37 11/14 = 75 16/70 - 37 55/70 = 74 86/70 - 37 55/70 = 37 31/70,
2.
15 9/77 + (12 5/33 - 4 19/21) = 7 67/77,
1) 12 5/33 - 4 19/21 = 12 35/231 - 4 209/231 = 11 266/231 - 4 209/231 =
= 7 57/231 = 7 19/77,
2) 15 9/77 - 7 19/77 = 14 86/77 - 7 19/77 = 7 67/77,
4.
5 7/8 + 1,16 = 47/8 + 116/100 = 1175/200 + 232/200 =
= 1407/200 = 7 7/200 (или 7,035)