Question

[Sách Giáo Khoa]

Điền các dấu \(\left(\in,\notin,\subset\right)\) thích hợp vào chỗ trống :

\(-2........\mathbb{Q}\)                             \(1......\mathbb{R}\)                        \(\sqrt{2}......\text{I}\)

\(-3\dfrac{1}{5}......\mathbb{Z}\)                       \(\sqrt{9}........\mathbb{N}\)               \(\mathbb{N}.......\mathbb{R}\)

Answer 1

[Dương Nguyễn]

$-\mathrm{2\; \backslash (\backslash in\backslash )\; Q}$ $\mathrm{1\; \backslash (\backslash in\backslash )\; R}$ $\sqrt{2}\text{(in) I}$

$-3\frac{1}{5}\mathrm{\backslash (\backslash notin\backslash )\; Z}$ $\sqrt{9}\mathrm{\backslash (\backslash in\backslash )\; N}$ $N\mathrm{\backslash (\backslash subset\backslash )\; R}$