4)27 11/101- х =23 15/101
х=27 11/101-23 15/101=26 112/101-23 15/101
х=3 97/101
(23 15/16+у)-4 13/16=28 11/16
23 15/16+у=4 13/16+28 11/16
23 15/16+у=32 24/16=33 8/16
у=33 8/16-23 15/16=32 24/16-23 15/16
у=9 9/16
5)10 7/25+12 9/25=22 16/25
30=29 25/25-22 16/25=7 9/25