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10 questions
12<x.y<1812<x.y<1812<x.y<18
−30<x.y<18-30<x.y<18−30<x.y<18
−20<xy<18-20<xy<18−20<xy<18
−20<x.y<12-20<x.y<12−20<x.y<12
21
20
23
22
10
11
12
13
⌊−9,−21⌋\lfloor-9,-21\rfloor⌊−9,−21⌋
(−9,−21)\left(-9,-21\right)(−9,−21)
ϕ\phiϕ
R
1/2
9
1
3
5
2
-1
4
3/2
5/2
7/2
6
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