№4
а) = 9 3/14 + 4 13/14 - 7 9/14 = 13 16/14 - 7 9/14 = 6 7/14 = 6 1/2
б) 10 1/25 + 9 24/25 - 6 9/25 = 20 - 6 9/25 = 13 16/25
в) = 9 4/31 - 8 12/31 = 8 35/31 - 8 12/31 = 24/31
№5
а) х = 27 11/101 - 23 15/101
х = 26 112/ 101 - 23 15/101
х = 3 97/101
б) 23 15/16 + х = 28 11/16 + 4 13/16
23 15/16 + х = 32 24/16
х = 32 24/16 - 23 15/16
х = 9 9/16