100%
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100楼#
发布于：2016-08-21 15:17
。。。。。。。。。
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101楼#
发布于：2016-08-21 15:20
图不对！！
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102楼#
发布于：2016-08-21 19:38
yxz2016622：构不成三角形吗。。直角三角形斜边中线定理：如果一个三角形是直角三角形,那么这个三角形斜边上的中线等于斜边的一半。 |
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