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梯形面積(求上底)
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lkkbmaths teachers 檔案儲存用
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二項分佈的副本
GGB printable logo 3
勾股树123
dandelin
毕氏螺线
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整數或分數÷分數_ 工作紙（一）_題1a
銀杏葉
指數函數的平移(2)
Apollonius Problem gergonne 3
External tangent
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