1) 6+5<х<11+5
11<х<16
2)6-7<х<11-7
-1<х<4
3) 6×0,4<х<11×0,4
2,4<х<4,4
4) 1/6×6<х<1/6×11
1<х< 1целая 5/6
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Answers & Comments
1) 6+5<х<11+5
11<х<16
2)6-7<х<11-7
-1<х<4
3) 6×0,4<х<11×0,4
2,4<х<4,4
4) 1/6×6<х<1/6×11
1<х< 1целая 5/6