Вопрос пользователя:
помогите решить ( с объяснением) 3+8 5/12; 10 6/7 -3; 4 2/13+ 5 7/13; 8+ 7/12- 4 2/12; 4 8/11+5 7/11; 7 5/9- 2 8/9;7-3/8; 10 – 3 7/15
Илюха отвечает:
3+8 5/12=(8+3) + 5/12 = 11 5/12
10 6/7 -3=(10-3) + 6/7=7 6/7
4 2/13+ 5 7/13= (4+5) + (2/13 + 7/13) = 9 9/13
8+ 7/12- 4 2/12 = (8-4) + (7/12-2/12) = 4 5/12
4 8/11+5 7/11=(4 + 5) + (8/11 + 7/11) = 9 15/11= 10 4/11
7 5/9- 2 8/9=(7-1) + (5/9 +9) – 2 8/9=6 14/9 – 2 8/9 = (6-2)+(14/9 – 8/9) = 4 6/9
7-3/8= (7-1) + 8/8 – 3/8 = 6 8/8 – 3/8 = 6 5/8
10 – 3 7/15= (10-1) + 15/15 – 3 7/15= 9 15/15 – 3 7/15= (9-3)+ (15/15 – 7/15) = 6 8/15