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Author:
luodeqin@keleshuxue.com
GeoGebra
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畫出對稱圖形
四邊形的特性
異分母分數減法
三位數除以一位數(一)
算柱 (兩位數)
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waaachen
△ A B E △ABE 、 △ A C E △ACE 的內切圓半徑分別為 r 2與 r 1,兩者 可以互換嗎
reflection of tetrahedron
平行四邊形堆垛
五年級 排水法
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Symmetry
Expected Value
Addition
Geometric Transformations
Trapezoid