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Author:
马云辉
GeoGebra
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異分母分數減法
画直线等分三角形的面积
兩位數除以一位數（二）
拼砌四邊形
兩組對邊相等和有直角的四邊形
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carrito
Homework3
二次函數的圖形-平移版
圓心
勾股定理的直观证明（义务教育数学 新课标-例82）
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Piecewise Functions
Binomial Distribution
Conditional Probability
Logarithmic Functions
Quadratic Functions