Автор - jasmina3113
Ответ:
1) 7/8 - 1/4 = 1*7/1*8 - 2*1/2*4 = 7/8 = 2/8 = 7-2/8 = 5/8
2) 9
/10 - 3/5 = 1*9/1*10 - 2*3/2*5 = 9/10 - 6/10 = 9-6/10 = 3/10
3) 5/6 - 3/8 = 4*5/4*6 - 3*3/3*8 = 20/24 - 9/24 = 20-9/24 = 11/24
4) 2/9 - 2/5 = 5*2/5*9 = 9*2/9*5 = 10/45 - 18/45 = 10-18/45 = 8/45