(30/27-1/3)*2 1/7+3/5
= 2 4/15
по действиям можно?
1) 30/27 - 1/3 = 30/27 - 9/27 = 21/27 = 7/9
2) 7/9 * 2 1/7 = 7/9 * 15/7 = 5/3
3) 5/3 + 3/5 = 25/15 + 9/15 = 34/15 = 2 4/15
Решите задачу: