1. 199\500
2.13\50
3.3\8
4.7\1250
{3(х-1)<-3
{5(х+3)>=х+3.
{3х-3<-3
5х+15>=х+3
{3х<-3+3
{5х-х>=3-15
{3х<0
{4х>=-12.
{х<0
х>=-4
____-4\\\\\\\..__0.
оьвет:(-4;0).
11х+8х=456
19х=456/19
х=24
14х-х-28=167
13х=195/13
х=15
16х-439+524=997
16х=912/16
х=57
144=2·2·2·2·3·3
125=5·5·5
НОК (144;125)=5·5·5·2·2·2·2·3·3=18000