(1 1/5 + 5 8/9 : 1 17/36) · 5/21 = 1 5/21
1) 5 8/9 : 1 17/36 = 53/9 : 53/36 = 53/9 · 36/53 = 36/9 = 4
2) 1 1/5 + 4 = 5 1/5 = 26/5
3) 26/5 · 5/21 = 26/21 = 1 5/21
ответ: 1 целая 5/21.
(1 1/5 + 5 8/9 : 1 17/36) · 5/21 = 1 5/21
1) 5 8/9 : 1 17/36 = 53/9 : 53/36 = 53/9 · 36/53 = 36/9 = 4
2) 1 1/5 + 4 = 5 1/5 = 26/5
3) 26/5 · 5/21 = 26/21 = 1 5/21
ответ: 1 целая 5/21.