Сделайте деяния а)5/6-3/4 б)1/3+1/5 в)3/10+1/2 г)1/3-1/7 д)2/9+0 е)9/20+3/8 ж)19/75-11/50 з)13/50-17/75 и)11/14+8/21

Чтоб выполнить деянья, поначалу приведем дроби к общему знаменателю:

1) 5/6 - 3/4 = (5 * 2)/12 - (3 * 3)/12 = 10/12 - 9/12 = 1/12;

2) 1/3 + 1/5 = 5/15 + 3/15 = (5 + 3)/15 = 8/15;

3) 3/10 + 1/2 = 3/10 + (1 * 5)/10 = 3/10 + 5/10 = 8/10 = 4/5;

4) 1/3 - 1/7 = 7/21 - 3/21 = 4/21;

5) 2/9 + 0 = 2/9;

6) 9/20 + 3/8 = (9 * 2)/40 + (3 * 5)/40 = 18/40 + 15/40 = 33/40;

7) 19/75 - 11/50 = (19 * 2)/150 - (11 * 3)/150 = 38/150 - 33/150 = 5/150 = 1/30;

8) 13/50 - 17/75 = 39/150 - 34/150 = 5/150 = 1/30;

9) 11/14 + 8/21 = 33/42 + 16/42 = 49/42 = 1 7/42 = 1 1/6;

10) 7/15 - 0 = 7/15.