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树常青
GeoGebra
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圓的切線方程
活动三：应用性质
祖冲之的期望：内棋与外棋
科氏力 (Coriolis Force)
直線的斜率：水平變化 & 鉛垂變化
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垂心
Quiz on Factorization of Quadratic Polynomials (Table Method) 因式分解一元二次多項式(表格法)：測驗
winter vacation homework 12
雙心運動 大
均分除法（分數÷整數）
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Division
Arithmetic Operations
Planes
Percentages
Numbers