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            <div><span style="font-size: medium">a (5)</span></div>
            </td>
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</p>
<div><span style="font-size: medium">&nbsp;</span></div>
<div><span style="font-size: medium">当a*a=b时，按照标号顺序可填出下列的群：</span></div>
<p>
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