Các số tự nhiên lớn hơn `4` và không vượt quá `7` là: `5 ; 6 ; 7`
`+)` Cách `1:`
`A = {5 ; 6 ; 7}`
`+)` Cách `2:`
`A = {x ∈ NN ║4 < x ≤ 7}`
Giải thích các bước giải:
Cách 1: A ={5 ; 6}
- Liệt kê các phần tử.
Cách 2: A={x ∈ N/ 4< x < 7}
- Chỉ ra tính cất đặc trưng của các phần tử
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