2 дробь7/10+ 9 дробь2/15
2 дробь7/10+ 9 дробь2/15=11 21/30+4/30=11 25/30=11 5/6
2 7\10 + 9 2\15 =2 21\30 + 9 4\30 = 11 25\30 = 11 5\6