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<br />王晓明书上的推导是双极性的，我把等腰三角形都往上移动了<br /><img src="https://bbs.21ic.com/upfiles/img/200712/200712493524971.gif"><br /><img src="https://bbs.21ic.com/upfiles/img/200712/200712493937396.gif"><br /><br /> 相关链接:<a href='https://bbs.21ic.com/upfiles/img/200712/20071249300859.pdf'>https://bbs.21ic.com/upfiles/img/200712/20071249300859.pdf</a> |
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