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<TR><TD vAlign=center align=middle colSpan=4><H2>  31</H2></TD></TR>
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<P class="infodata">: '</P></TD></TR><TR><TD colSpan=4><P class="textbody"><br>
<center>
<p>     31       5, 6, 7  8,     ; </p>
<p>    ;</p></center>
  ޻   : 5, 6, 7  8     +, -, x, :, (, ), C  =. 

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