Ответ:
5a-b/3
5<a<9
25<5a<45
2/3<b/3<7/3
-2/3>-b/3>-7/3
т.е. -7/3<-b/3<-2/3
25-7/3<5a-b/3<45-2/3
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Ответ:
5a-b/3
5<a<9
25<5a<45
2/3<b/3<7/3
-2/3>-b/3>-7/3
т.е. -7/3<-b/3<-2/3
25-7/3<5a-b/3<45-2/3