\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\usepackage[left=0.7cm,right=2cm,top=2cm]{geometry}
\usepackage[croatian]{babel}
%\usepackage[dvips]{graphicx}
\usepackage{amssymb} \usepackage{fancybox}
\usepackage{latexsym} \usepackage{eurofont}
\usepackage{enumerate}
%\addtolength{\hoffset}{-2.5cm} \addtolength{\textwidth}{2cm}
%\addtolength{\topmargin}{-2.7cm} \addtolength{\textheight}{3.5cm}
\usepackage{graphicx}
\begin{document}
%\thispagestyle{empty}
\begin{center}
\shadowbox{Svojstva funkcija}\\[2pt]
\end{center}
\vspace{1.5cm}
\begin{tabular}{cc}
a) $f(x)=\dfrac{2\sqrt{x}}{3-x^2}$&b) $f(x)=\sqrt{x+5}$\\
\includegraphics[scale=0.9]{fun1.png}&\includegraphics[scale=0.9]{fun2.png}\\[2cm]
c) $f(x)=\dfrac{4}{x^2+3}$&d) $f(x)=e^{5-x}$\\
\includegraphics[scale=0.9]{fun3.png}&\includegraphics[scale=0.9]{fun4.png}
\end{tabular}

\newpage
\vspace*{2cm}
\begin{tabular}{@{\hspace*{-10pt}}cc}
e) $f(x)=\dfrac{2x^2}{3-x^2}$&f) $f(x)=\sqrt[3]{x+5x^5}$\\
\includegraphics[scale=0.9]{fun5.png}&\includegraphics[scale=0.9]{fun6.png}\\[2cm]
g) $f(x)=\log_4{\dfrac{3+2x}{3-2x}}$&h) $f(x)=e^{x^2-4x+3}-1$\\
\includegraphics[scale=0.9]{fun7.png}&\includegraphics[scale=0.9]{fun8.png}
\end{tabular}

\newpage
\vspace*{1.5cm}
\begin{center}
\begin{tabular}{c}
i) $f(x)=\sin{2x}\cos{3x}$\\
\includegraphics{fun9.png}\\[2cm]
j) $f(x)=\sin{\dfrac{1}{x}}$\\
\includegraphics{fun10.png}
\end{tabular}
\end{center}

\newpage
\begin{center}
\shadowbox{Injekcija, surjekcija, bijekcija}\\[2pt]
\end{center}
\vspace{1.5cm}

\begin{tabular}{@{\hspace*{-10pt}}cc}
a) $f(x)=\log_2{\big(4x^2\big)}$&b) $f(x)=2^{x+3}$\\
\includegraphics[scale=0.9]{bijekcija1.png}&\includegraphics[scale=0.9]{bijekcija2.png}\\[2cm]
c) $f(x)=\dfrac{3}{3x^2+1}$&d) $f(x)=\dfrac{x}{4-2x}$\\
\includegraphics[scale=0.9]{bijekcija3.png}&\includegraphics[scale=0.9]{bijekcija4.png}
\end{tabular}

\end{document}
