1) -3.2•1.4←ху←6.8•3.4
-4.48<Ху<23.12
2) -3.2+1.4<х+у<6.8+3.4
-1.8<х+у<10.2
3) -3.2-1.4<х-у<6.8-3.4
-4.6<х-у<3.4
4) -3.2/1.4<х/у<6.8/3.4
-16/5/7/5<х/у<34/5/17/5
-16/7<х/у<35/17
-2 2/7<х/у<2
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Answers & Comments
1) -3.2•1.4←ху←6.8•3.4
-4.48<Ху<23.12
2) -3.2+1.4<х+у<6.8+3.4
-1.8<х+у<10.2
3) -3.2-1.4<х-у<6.8-3.4
-4.6<х-у<3.4
4) -3.2/1.4<х/у<6.8/3.4
-16/5/7/5<х/у<34/5/17/5
-16/7<х/у<35/17
-2 2/7<х/у<2