1) 6+5<x+5≤11+5; 11<x+5≤16
2)6-7<x-7≤11-7; -1<x≤4
3)6*0.4<0.4x≤0.4*11; 2.4<0.4x≤4.4
4)6/6<x/6≤11/6; 1<x/6≤1 5/6
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Answers & Comments
1) 6+5<x+5≤11+5; 11<x+5≤16
2)6-7<x-7≤11-7; -1<x≤4
3)6*0.4<0.4x≤0.4*11; 2.4<0.4x≤4.4
4)6/6<x/6≤11/6; 1<x/6≤1 5/6