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三棱锥的三视图
Author:
DongHai Zhang
GeoGebra
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異分母分數減法
【案例】2018年全国1卷理科12题
【案例】2013年安徽高考15题
兩位數除以一位數（一）
拼砌四邊形
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希瓦定理
reflectional symmetry_4
moon
串珠(大小不同)
正圆锥展开图
Discover Topics
Ratios
Translation
Differential Equation
Derivative
Vectors