( 1 12\12 - 1 7\12 = 5\12 ................................... 3\8 - 1\6 = (18 - 8)\48 = 10\48 = 5\24 ............................................. 5\12 : 5\24 = 2 .............................. 2\1 * 13\4 = 13\2 = 6.5 ................................ ответ: 6.5