# table LaTeX on the right the table does not close

i have problem with table LaTeX,on the right the table does not close

\documentclass[a4paper, 12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[russian]{babel}
\usepackage{amsfonts, amssymb, amsmath, array}
\usepackage{shapepar, pifont, color, enumerate}
\usepackage{multirow}
\voffset-30mm
\hoffset-15mm
\textwidth175mm
\textheight260mm

\begin{document}
\begin{tabular}[t]{|c|c|c|c|c|c|c|c|c|c|c|}
\hline
$x$ & $\left(-\infty;{0}\right)$  & $\left(0\right)$ & $\left(0;\frac{{4}}{3}\right)$ & $\frac{{4}}{3}$ & $\Big(\frac{{4}}{3};{\frac{8}{3}}\Big]$ & ${\frac{8}{3}}$  &   $\left(\frac{{8}}{3};+\infty\right)$ \\
\hline
$f'(x)$ & $-$ & $0$ & $+$ & $+$ & $0$ & $-$ & $-$  \\
\hline
$f''(x)$ & $+$ & 0 & {$-$}& {$-$} & 0 & $+$ & $+$  \\
\hline
{$f(x)$} & {$\searrow$} & $f_{max}=$  &\multicolumn{2}{c|} {\multirow{2}{*}{$\nearrow$}} & $f_{min}=$ & \multicolumn{2}{c|} {\multirow{2}{*}{$\searrow$}} \\
& \multicolumn{1}{c|}{\phantom{,}} & ${\frac{121}{81}}$ & \multicolumn{2}{c|}{\phantom{,}} &  ${-\frac{5}{3}}$ \\
\cline{2-8}
&\multicolumn{3}{c|}{\multirow{2}{*}{{\Large $\smile$}}}  &Точка перегиба& \multicolumn{3}{c|}{\multirow{2}{*}{{\Large $\frown$}}} \\
& \multicolumn{3}{c|}{\phantom{,}}      & \\
\hline
\end{tabular} \\
\end{document}


• in rows with missing vertical lines you not have all ampersands. since code of the your table is very difficult to understand, please find yourself, where is missing or reduce your mwe just this table and remove all what is not relevant to this table. welcome to tex.se! – Zarko Jun 17 '18 at 12:08
• I tried to compile it and it works just fine. Simply I don't have the math but Cyrillic text. – gvgramazio Jun 17 '18 at 12:12
• I reduced my code – Easywoid Jun 17 '18 at 12:24
• Off-topic: It is usually a bad Idea to change \hoffset and \voffset manually. \textwidth and \textheight should be changed with the geometry package... – Phelype Oleinik Jun 17 '18 at 12:27
• Excuse me, please, my English-level A2 and I do not understand you well), could you please correct my code? Please, I will be very grateful to you – Easywoid Jun 17 '18 at 12:32

Why do you declare 11 columns when you use 8? I simplified you code to use the array environment, replaced \multirow with \makecell, which allows for line breaks in standard cells and added some vertical padding to the cells.

Unrelated: your way of specifying layout parameters isn' correct (the space for margin notes overflows outside the paper sheet). You should use the geometry package, which is more intuitive.

\documentclass[a4paper, 12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[russian]{babel}
\usepackage{amssymb, amsmath, array}
\usepackage{ makecell, bigstrut}
\voffset-30mm
\hoffset-15mm
\textwidth175mm
\textheight260mm

\begin{document}

$\setcellgapes{4pt}\makegapedcells \begin{array}[t]{|*{8}{c|}} \hline x & (-\infty;{0} ) & (0 ) & \bigl(0;\frac{4}{3}\bigr) & \frac{4}{3} & \bigl(\frac{4}{3};{\frac{8}{3}}\bigr] & \frac{8}{3} & \bigl(\frac{{8}}{3};+\infty\bigr) \\ \hline f'(x) & - & 0 & + & + & 0 & - & - \\ \hline f''(x) & + & 0 & {-}& {-} & 0 & + & + \\ \hline {f(x)} & {\searrow} &\makecell{f_\text{max}=\\ \frac{121}{81}} &\multicolumn{2}{c|} {\nearrow} & \makecell{f_\text{min}= \\ -\frac{5}{3}} & \multicolumn{2}{c|} {\searrow} \\ \cline{2-8} &\multicolumn{3}{c|}{\text{\Large  \smile }} & \bigstrut[t]\text{Точка перегиба}& \multicolumn{3}{c|}{\text{\Large  \frown }} \\ \hline \end{array}$

\end{document}


with use of the packages makecell and tabularx, page layout determined by the package geometry:

\documentclass[a4paper, 12pt]{article}
\usepackage[margin=25mm]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[russian]{babel}
\usepackage{amssymb,
nccmath} % for midsize fraction \mfrac{}{}. it also call amsmath
\usepackage{makecell, tabularx}

%---------------- show page layout. don't use in a real document!
\usepackage{showframe}
\renewcommand\ShowFrameLinethickness{0.15pt}
\renewcommand*\ShowFrameColor{\color{red}}
%---------------------------------------------------------------%

\begin{document}

\begingroup
\centering
\setcellgapes{4pt}\makegapedcells
\setlength\tabcolsep{3pt}
\begin{tabularx}{\linewidth}[t]{|>{\centering\arraybackslash $}l<{$}|
*{7}{>{\centering\arraybackslash $}X<{$}|}}
\hline
x & (-\infty;{0} ) & (0 ) & \Bigl(0;\mfrac{4}{3}\Bigr) & \mfrac{4}{3} & \Bigl(\mfrac{4}{3};{\mfrac{8}{3}}\Bigr] & \mfrac{8}{3} & \Bigl(\mfrac{{8}}{3};+\infty\Bigr) \\
\hline
f'(x) & - & 0 & + & + & 0 & - & - \\
\hline
f''(x) & + & 0 & {-}& {-} & 0 & + & + \\
\hline
{f(x)} & {\searrow} &\makecell{f_\text{max}=\mfrac{121}{81}} &\multicolumn{2}{c|}{$\nearrow$}
& \makecell{f_\text{min}=-\mfrac{5}{3}} & \multicolumn{2}{c|} {$\searrow$} \\
\cline{2-8}
& \multicolumn{3}{c|}{\text{\Large $\smile$}}
& \makecell{\text{Точка}\\ \text{перегиба}}
& \multicolumn{3}{c|}{\text{\Large $\frown$}} \\
\hline
\end{tabularx}
\end{document}