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圆内的迭代反射
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GeoGebra
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【案例】2018年全国1卷理科12题
第八周作业
球体的体积推导（优化版）
畫出對稱圖形
兩組對邊相等和有直角的四邊形
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triangle
Relations Among Trigonometric Ratios 三角比的關係
遊戲與圖像
滾動的圓
函数作图工具的副本
勾股定理介绍及证明
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Means
Kite
Arithmetic Operations
Orthocenter
Hypothesis Testing