Ефим8 лет назад
Вычислим значения:
1. 7/15 + (2/15 + 1/15) = 2/3;
1) 2/15 + 1/15 = (2 + 1)/15 = 3/15;
2) 7/15 + 3/15 = (7 + 3)/15 = 10/15 = 2/3.
2. 3/16 + (1/16 + 5/8) = 7/8;
1) 1/16 + 5/8 = (1 + 2 * 5)/16 = (1 + 10)/16 = 11/16;
2) 3/16 + 11/16 = (3 + 11)/16 = 14/16 = 7/8.
3. (1/13 + 1/14) + 12/13 = 1/13 + 1/14 + 12/13 = 1 1/14;
1) 1/13 + 12/13 = 13/13 = 1;
2) 1 + 1/14 = 1 1/14.
4. 12/17 + 15/24 + 3/8 + 5/17 = 2;
1) 12/17 + 5/17 = (12 + 5)/17 = 17/17 = 1;
2) 15/24 + 3/8 = 15/24 + 9/24 = 24/24 = 1;
3) 1 + 1 = 2.
5. 3/7 + 5/9 + 4/9 + 4/7 = 2;
1) 3/7 + 4/7 = 7/7 = 1;
2) 5/9 + 4/9 = 9/9 = 1;
3) 1 + 1 = 2.