`a) F = { x ∈ NN| 100 ≤ x < 1000}`
``
`b) E = { x ∈ NN^** | x < 8}`
`c) A = { x ∈ NN| x < 6}`
`d) C = { x ∈ NN | 4 < x < 10}`
Đáp án + Giải thích các bước giải:
a) $F=\{x\in \mathbb{N}|999\ge x\ge100\}$
b) $E=\{x\in \mathbb{N}|7\ge x\ge1\}$
c) $A=\{x\in \mathbb{N}|5\ge x\ge0\}$
d) $C=\{x\in \mathbb{N}|9\ge x\ge4\}$
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