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梯形面積(求上底)
Author:
lkkbmaths teachers 檔案儲存用
GeoGebra
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算柱 (兩位數)
異分母分數減法
【案例】圆柱体内放置一个大球六个小球
四邉形 (四年級) 教師版
三位數除以一位數（一）
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Addition of 3 Directed Numbers
test
第三冊2-2習題12
三年級除法(四)：一位數除三位數
拋物線6--包絡線法
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Equilateral Triangles
Translation
Cosine
Arithmetic Mean
Random Variables