Verified answer

Объяснение:

1) 81 2/15 - 29 4/21 = 81 14/105 - 29 20/105 =

80 119/105 - 29 20/105 = 51 99/105 = 51 33/35

2) 32,098 + 5,902 = 38

3) 49 1/7 - 30 10/21 = 49 3/21 - 30 10/21 =

48 24/21 - 30 10/21 = 18 14/21 = 18 2/3

4) 51 33/35 * 38 = 1818/35 * 38 = 69084/35

5) 69084/35 : 18 2/3 = 69084/35 : 56/3 = 69084/35 * 3/56 = 17271/35 * 3/14 = 51813/490 = 105 363/490