Сделайте вычитание: 1) 3целых 1\16 - 1\8 2) 7целых 9\20 -

Выполним деяния приведя дроби к общему знаменателю:

1) 3 1/16 - 1/8 = (3 * 16 + 1)/16 - 2/16 = 49/16 - 2/16 = 47/16 = 2 15/16;

2) 7 9/20 - 5 17/30 = 7 - 5 + (9 * 3)/60 - (17 * 2)/30 = 2 + 27/60 - 34/60 = 2 - 7/60 = 1 + 60/60 - 7/60 = 1 53/60;

3) 4 2/7 - 1 4/9 = 4 - 1 + (2 * 9)/63 - (4 * 7)/63 = 3 + 18/63 - 28/63 = 3 - 10/63 = 2 + 63/63 - 10/63 = 2 53/63;

4) 8 5/36 - 1 43/108 = 8 - 1 + (5 * 3)/108 - 43/108 = 7 + 15/108 - 43/108 = 7 - 28/108 = 6 + 27/27 - 7/27 = 6 20/27;

5) 9 7/9 - 4 5/6 = 9 - 4 + (7 * 2)/18 - (5 * 3)/18 = 5 + 14/18 - 15/18 = 5 - 1/18 = 4 + 18/18 - 1/18 = 4 17/18.