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johnmayhk
GeoGebra
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兩位數除以一位數(一)
柱體建築師
兩位數除以一位數(二)
四邉形 (四年級) 教師版
四邊形的特性
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同分母分數除法
Trigonometric Relations(90,270)
橢圓規Ellipsograph (Trammel of Archimedes)
兩位數除兩位數(例子二)
加减法练习
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Step Functions
Differential Calculus
Median Line
Mathematics
Rectangle