(20 16/25+13 9/ 4/14+7 13/14) решение подробно

1) 20 16/25 + 13 9/25 = 33 29/25 = 34 4/25
2) 23 4/14 + 7 13/14 = 30 17/14 = 31 3/14
3) 34 4/25 - 31 3/14 = 34 56/350 - 31 75/350 = 33 350/350 - 31 75/350 = 2 275/350 = 2 11/14