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johnmayhk
GeoGebra
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球体的体积推导
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
錐體建築師
拼砌四邊形
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Add and subtract
HW3.NationalFlag
直線排列1
Time
直线与圆的位置关系
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Intersection
Dilation
Equations
Rhombus
Fractions