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暗棋的步距
Author:
李春培
暗棋的步距
GeoGebra
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兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
柱體建築師
錐體建築師
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六下_圓周(教師版)
三角形面積公式A
勘根定理
正弦函数图象
勾股定理：射影无字证明
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Expected Value
Solids or 3D Shapes
Mode
Rectangle
Complex Numbers