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GeoGebra
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三位數除以一位數（二）
三位數除以一位數（一）
【案例】2018年全国1卷理科12题
柱體建築師
兩組對邊相等和有直角的四邊形
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餘弦定理
earth
谢尔宾斯基三角形
圓與切線
圆面积公式推导
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General Quadrilateral
Distributions
Difference and Slope
Real Numbers
Conditional Probability