а)4 8/13-x=1 5/13 б)x+1 3/14=3 9/14 в)2 11/15+x=5 2/15 г)x-2 5/16=4

а) 4 8/13 - x = 1 5/13.
    4 8/13 = (52 + 8)/13 = 60/13.
    1 5/13 = 18/13.
 1. х = 60/13 - 18/13 = 42/13 = 3 3/13.
б) x + 1 3/14 = 3 9/14.
    1 3/14 = (14 + 3)/14 = 17/14.
    3 9/14 = 51/14.
 1. х = 51/14 - 17/14 = 34/14 сократим на 2 = 17/7 = 2 3/7.
в) 2 11/15 + x = 5 2/15.
    2 11/15 = (30 + 11)/15 = 41/15.
    5 2/15 = (5 * 15 + 2)/15 = 77/15.
 1. х = 77/15 - 41/15 = 36/15 сократим на 3 = 12/5 = 2 2/5.
г) x - 2 5/16 = 4 13/16.
    2 5/16 = (2 * 16 + 5)/16 = 37/16.
    4 13/16 = (4 * 16 + 13)/16 = 77/16.
 1. х = 77/16 + 37/16 = 114/16 сократим на 2 = 57/8 = 8 1/8.
д) 5 15/19 - x = 3 3/19.
    5 15/19 = (5 * 19 + 15)/19 = 110/19.
    3 3/19 = 60/19.
 1. х = 110/19 - 60/19 = 50/19 = 2 12/19.
е) x + 1 11/18 = 3 7/18.
    1 11/18 = (1 * 18 + 11)/18 = 29/18.
    3 7/18 = (3 * 18 + 7)/18 = 61/18.
 1. х = 61/18 - 29/18 = 32/18 сократим на 2 = 16/9 = 1 7/9.