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黃斌
GeoGebra
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祖冲之的期望:内棋与外棋
圓的切線方程
【案例】2013年安徽高考15题
三位數除以一位數(二)
漂亮的摇摆曲线
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正弦定理
複合圖形(三)
ycps4a1
面積2轉正三角形
兩位數乘三位數直式
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Vectors
Conic Sections
Logarithm
Statistical Characteristics
Definite Integral