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一道小学数学题
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一道小学数学题 - 闲着也是闲着， 一道小学数学题，给大家解解闷子： 任意三角形ABC。D、E、F点为 各边的3等分点，即，AD=2BD，BE=2EC，CF=2AF已知三角形ABC的面积为S，求阴影部分面积
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