Đề bài
Chọn kí hiệu “\( \in \)”, “\( \notin \)” thích hợp cho:
Phương pháp giải - Xem chi tiết
\(\mathbb{N}=\{{0;1;2;3;...\}}\)
\(\mathbb{Z}=\{{...;-3;-2;-1;0;1;2;3;...\}}\)
\(\mathbb{Q}=\{{\dfrac{a}{b}:a,b \in Z, b\ne0\}}\)
Lời giải chi tiết
a) – 13 \( \notin \) \(\mathbb{N}\);
b) – 345 987 \( \in \)\(\mathbb{Z}\);
c) 0 \( \in \)\(\mathbb{Q}\);
d) \(10\dfrac{{34}}{{75}}\)\( \in \)\(\mathbb{Q}\);
e) \(\dfrac{{301}}{{756}}\)\( \notin \)\(\mathbb{Z}\);
g) \(\dfrac{{13}}{{ - 499}}\)\( \in \)\(\mathbb{Q}\);
h) – 11, 01\( \notin \)\(\mathbb{Z}\);
i) \(\dfrac{{ - 21}}{{ - 128}}\)\( \in \)\(\mathbb{Q}\);
k) 0,3274 \( \in \) \(\mathbb{Q}\).
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