Решите: 7 8/15 + (5 7/10 - 4)
7 8/15 + (5 7/10 - 4) = 7 8/15 + 1 7/10 = (7 + 1) + (8/15 + 7/10) = 8 + (16/30 + 21/30) = 8 + 37/30 = 9 7/30