Сума чисел C та 2 так відноситься до числа d, як число 5 відноситься до числа 7

​

15 - 8/41 = 14 41/41 - 8/41 = 14 33/41
5 3/7 - 4 = 5 3/7 - 3 7/7 = 1 3/7
9 8 /17-5 = 9 8/17 - 4 17/17 = 4 8/17
8-5/19 = 7 19/19 - 5/19 = 7 14/19
9-5 1/12 = 8 12/12 - 5 1/12 = 3 11/12
6-8/9 = 5 9/9 - 8/9 = 5 1/9
4 3/8-1/5 = 35/8 - 1/5 = (35*5 - 1*8)/40 = 167/40 = 4 7/40
6 1/2-2/5 = 13/2 - 2/5 = (13*5 - 2*2)/10 = 61/10 = 6 1/10
9 5/6-1/3 = 59/6 - 1/3 = (59 - 1*2)/6 = 57/6 = 9 1/2
5 1/3- 2/9 = 16/3 - 2/9 = (16*3 - 2)/9 = 46/9 = 5 1/9
8 17/21-2/3 = 185/21 - 2/3 = (185 - 2*7)/21 = 171/21 = 8 1/7
3 5/7-5/6 = 26/7 - 5/6 = (26*6 - 5*7)/42 = 121/42 = 2 37/42
1 2/3-1/8 = 5/3 - 1/8 = (5*8 - 1*3)/24 = 37/24 = 1 13/24

1. (29 - 6 5/8) - (4 - 5/7) = 19 5/56
1) 29 - 6 5/8 = 28 8/8 - 6 5/8 = 22 3/8
2) 4 - 5/7 = 3 7/7 - 5/7 = 3 2/7
3) 22 3/8 - 3 2/7 = 22 21/56 - 3 16/56 = 19 5/56

2. (46 2/9 - 25) - (11 4/7 - 2/3) = 10 20/63
1) 46 2/9 - 25 = 21 2/9
2) 11 4/7 - 2/3 = 11 12/21 - 14/21 = 10 33/21 - 14/21 = 10 19/21
3) 21 2/9 - 10 19/21 = 21 14/63 - 10 57/63 = 20 77/63 - 10 57/63 = 10 20/63

3. (6 9/14 - 1/8) - (1 - 5/7) = 6 13/56
1) 6 9/14 - 1/8 = 6 36/56 - 7/56 = 6 29/56
2) 1 - 5/7 = 2/7
3) 6 29/56 - 2/7 = 6 29/56 - 16/56 = 6 13/56

4. (11 1/2 - 4/15) - (7 - 19/30) = 4 13/15
1) 11 1/2 - 4/15 = 11 15/30 - 8/30 = 11 7/30
2) 7 - 19/30 = 6 11/30
3) 11 7/30 - 6 11/30 = 10 37/30 - 6 11/30 = 4 26/30 = 4 13/15