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內輪差...
Author:
dunst kang
GeoGebra
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兩位數除以一位數（二）
拼砌四邊形
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
【案例】圆柱体内放置一个大球六个小球
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扇形的弧長與面積
No.2
棒形圖1
不规则平移
数一数这是几边形
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Mathematics
Parabola
Logic
Random Variables
Fractions