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圓心角
Author:
范欣茹
GeoGebra
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兩組對邊相等的四邊形
兩位數除以一位數（二）
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
兩位數加法
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click and Jump to up
二年級_錐體的觀察
Reflectionnn
切割正立方體
雙曲線諸元
Discover Topics
Power Functions
Natural Numbers
Logarithm
Sine
Circumcircle or Circumscribed Circle