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垂直線的斜率_hui sir
Author:
Hui Sir
GeoGebra
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兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
兩位數除以一位數（一）
兩位數加法
三位數除以一位數（二）
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等比數列等比數列
賺賠：例2
生日悖論
Angle (Extended 2)
勝者即正義，可愛即正義~
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Arithmetic Operations
Mathematics
Power Functions
Statistics
Ratios