Question

Thay ? bằng kí hiệu \( \in ,\, \notin \) thích hợp:

 

Answer 1

\(\begin{array}{l} - 7 \notin \mathbb{N};\,\,\,\,\,\,\, - 17 \in \mathbb{Z};\,\,\,\,\,\,\,\,\,\,\, - 38 \in Q\\\frac{4}{5} \notin \mathbb{Z};\,\,\,\,\,\,\,\,\,\,\,\frac{4}{5} \in \mathbb{Q};\,\,\,\,\,\,\,\,\,\,\,\,\,\,0,25 \notin \mathbb{Z};\,\,\,\,\,3,25 \in Q\end{array}\)

Answer 2

\(-7\notin N;-17\in Z;-38\in Q;\dfrac{4}{5}\notin Q\)

\(\dfrac{4}{5}\in Q;0,25\notin Z;3,25\in Q\)

Answer 3

a) ∉

b) ∈

c) ∈

d) ∉

e) ∈

f) ∉

h) ∈

(Theo thứ tự từ trái qua phải)