2/5 < х/15 < 2/3
2/5 < х/15 < 2/3 | * 15
30/5 < x < 30/3
6 < x < 10
x ∈ (6;10) =>
=> 7,8,9 -> варіант В).
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2/5 < х/15 < 2/3
2/5 < х/15 < 2/3 | * 15
30/5 < x < 30/3
6 < x < 10
x ∈ (6;10) =>
=> 7,8,9 -> варіант В).