为什么三角形中线组成的三角形面积等于这个三角形面积的 34?百度上写的,在性质的最后一行? 知乎 Template




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tomski为什么三角形中线组成的三角形面积等于这个三角形面积的 34?百度上写的,在性质的最后一行? 知乎 coloring