1)4 4/7+6 1/4=
2) 5 7/8-3 5/6​

Пошаговое объяснение:

1) 4/15 + 3/4 = 4 * 4/15 * 4 + 3 * 15/4 * 15 = 16/60 + 45/60 = 61/60 = 1 1/60 ;

2) 5/6 - 9/14 = 5 * 14/6 * 14 - 9 * 6/14 * 6 = 70/84 - 54/84 = 26/84 = 13/42 ;

3) 4 4/7 + 6 1/4 = 32/7 + 25/4 = 32 * 4/7 * 4 + 25 * 7 /4 * 7 = 128/28 + 175/28 = 303/28 = 10 23/28 ;

4) 5 7/8 - 3 5/6 = 5 7 *2/8 * 2 - 3 5 * 3/6 * 3 = 5 14/18 - 3 15 /18 =