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| $x$ | $-4$ | $-3$ | $-2$ | $-1$ | $0$ | $1$ | $2$ | $3$ | $4$ |
| $y = f(x) = x^2$ |
| $A$. $f(x)=\frac{|x+2|}{x+2}, x \neq-2$ | $1$. $[\frac{1}{3}, 1]$ |
| $B$. $g(x)=|[x]|, x \in R$ | $2$. $Z$ |
| $C$. $h(x)=|x-[x]|, x \in R$ | $3$. $W$ |
| $D$. $f(x)=\frac{1}{2-\sin 3x}, x \in R$ | $4$. $[0, 1)$ |
| $5$. $\{-1, 1\}$ |
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