3)(a+5)<(b+5); (b-11)>(a-11); (5-3b)<(5-3a); (3-0,5b)<(3-0,5a);
4)
a)7<a+b<12; 12<ab<35; б) -1<a-b<4; 0,8<a/b<7/3; в) -27<2a-7b<-7; 16/63<4b/9a<20/36; г) 2/23<(0,6b-0,2a)/(0,7a-0,1b)<22/23
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3)(a+5)<(b+5); (b-11)>(a-11); (5-3b)<(5-3a); (3-0,5b)<(3-0,5a);
4)
a)7<a+b<12; 12<ab<35; б) -1<a-b<4; 0,8<a/b<7/3; в) -27<2a-7b<-7; 16/63<4b/9a<20/36; г) 2/23<(0,6b-0,2a)/(0,7a-0,1b)<22/23