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蝴蝶定理动态演示
Author:
weizhuli(卫珠礼)
GeoGebra
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四邉形 (四年級) 教師版
異分母分數減法
兩組對邊相等和有直角的四邊形
四邊形的特性
柱體建築師
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廣義角
反射定律 Law of Reflection
半圓柱
三角柱算體積
三視圖04
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Step Functions
Symmetry
Parabola
Arithmetic