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var title_126207='Re:请教高手一些排列组合题目~~';
var body_126207='第三题:&nbsp;81,&nbsp;23,&nbsp;(&nbsp;),&nbsp;127<br><br>A.103&nbsp;&nbsp;&nbsp;B.114&nbsp;&nbsp;&nbsp;&nbsp;C.&nbsp;104&nbsp;&nbsp;&nbsp;D.57<br><br>答：前2个数和为第三个数：81+23=（），23+（）=127，所以答案为104，选C<br>';
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