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LaTeX practise mathematical formula arrays

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$$\begin{array}{llll}
a+b+c&uv&x-y&27\\\\
a+b&u+v&z&134\\\\
a&3u+vw&xyz&2978
\end{array}$$ 

 

$$\begin{array}{|l|l|l|l|}
\hline
a+b+c&uv&x-y&27\\\\
\hline
a+b&u+v&z&134\\\\
\hline
a&3u+vw&xyz&2978\\\\
\hline
\end{array}$$

 

 

{clcr} a+b+c uv x-y 27
a+b u+v z 134
a 3u+vw xyz 2978

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