问题描述:
一定要高一人教版的喔
问题解答:
http://www.baidu.com/s?ie=gb2312&bs=%B8%DF%D2%BB%C8%CB%BD%CC%B0%E6%CA%D4%CC%E2%CD%F8&sr=&z=&cl=3&f=8&wd=%B8%DF%D2%BB%C8%CB%BD%CC%B0%E6%CA%D4%CC%E2&ct=0
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