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三视图
Author:
sui
GeoGebra
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兩位數除以一位數（一）
算柱 (兩位數)
兩位數加法
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
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方塊圖_李樂雯
約分BB
geogebra
小一_比較20以內的數
躲掉1,-1,0的動態文字
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Random Variables
Normal Distribution
Fractions
Parallelogram
Trapezoid