1- х+121
2-х
3- х-81
(х+121)+х+(х-81)=1198
х+121+х+х-81=1198
3х+40=1198
3х=1158
х=386
1) 386+121=507
2)386
3)386-81=305
1- х+121
2-х
3- х-81
(х+121)+х+(х-81)=1198
х+121+х+х-81=1198
3х+40=1198
3х=1158
х=386
1) 386+121=507
2)386
3)386-81=305