证一个四边形,作出各边三等分点,连接对边对应三等分点,中间的小四边形是大四边形面积的九分之一(附图) 知乎 Template




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tomski证一个四边形,作出各边三等分点,连接对边对应三等分点,中间的小四边形是大四边形面积的九分之一(附图) 知乎 coloring