快！急急急急急i就急急急急急急i急急急急急急急急ii急急急急急急急急急急急急急~~~~~~~~~~~~~~~~~~~

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推荐答案 2012-05-12

关于第二题

获一、二等奖的同学占获奖总人数的3/8，则三等奖的同学占获奖总人数的5/8获二、三等奖的同学占获奖总人数的7/8，则一等奖的同学占获奖总人数的1/8

二等奖的同学占获奖总人数的1-5/8-7/8=1/4

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