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x : 3 < 4. 18 : x ≤ 2

Răspuns :

X:3<4/×3 =>x<12=> x={0,1,2,...,11}
18:x_<2/:18=>x_<2=>x={0,1,2}

1)

x/3 < 4
x < 4*3
x < 12
=> x∈(-∞, 12)
2)

18/x ≤ 2
9/x
≤ 1
9/x  - 1
  0
[tex] \frac{9-x}{x} [/tex]
≤ 0

=> x∈(-∞, 0)∪[9,+∞)