Интересно услышать подробности. Выполните действие: 1) 7 + 8/19; 2) 8/68 + 9; 3) 3 5/13 +4 7/16; 4) 12 8/13 - 8 4/13; 5) 5 17/21 - 3 8/21 + 4 7/21; 6)14 8/10 + 5 1/10 - 6 7/10

Выполним действия:


1) 7 + 8/19 = 7 8/19;


2) 8/68 + 9 = (2 * 4)/(4 * 17) + 9 = 2/17 + 9 = 9 2/17;


3) 3 5/13 + 4 7/16 = 3 + 4 + 5/13 + 7/16 = 7 + (5 * 16)/208 + (7 * 13)/208 = 7 + 80/208 + 91/208 = 7 + (80 + 91)/208 = 7 + 171/208 = 7 171/208;


4) 12 8/13 - 8 4/13 = 12 - 8 + 8/13 - 4/13 = 4 + (8 - 4)/13 = 4 + 4/13 = 4 4/13;


5) 5 17/21 - 3 8/21 + 4 7/21 = 5 - 3 + 4 + 17/21 - 8/21 + 7/21 = 6 + (17 - 8 + 7)/21 = 6 + 16/21 = 6 16/21;


6) 14 8/10 + 5 1/10 - 6 7/10 = 14 + 5 - 6 + 8/10 + 1/10 - 7/10 = 13 + (8 + 1 - 7)/10 = 13 + 2/10 = 13 + 1/5 = 13 1/5.