целых 10/13- 6целых 3/10 21целая 7/18- 1целая 1/24 13 целых- 9 целых вас

10 10/13-6 3/10=10 100/130-6 39/130=4 61/130
21 7/18-1 1/24=21 28/72-1 3/72=20 25/72
13-9 13/24=12 24/24-9 13/24=3 11/24

10 10/13  -  6 3/10 = 140/13  -  63/10 =(140 × 10  -  63 × 13)/130 = 1400/130  -  819/130 =  581/130 = 4 61/130
21 7/18  -  1 1/24 = 385/18  -  25/24 =   (385 × 4  -  25 × 3)/72 = 1540/72  -  75/72 =  1465/72 = 20 25/72
13  -  9 13/24 = 13/1  -  229/24 =(13 × 24  -  229 × 1)/24 = 312/24  -  229/24 =  83/24 = 3 11/24