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ch14 p.30#31
Author:
Ms HCF
GeoGebra
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四邊形的特性
算柱 (兩位數)
兩位數加法
異分母分數減法
兩組對邊相等和有直角的四邊形
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「ASS」
正弦定理的证明
等軸雙曲線
test
测试
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Planes
Cosine
Subtraction
Means
Tangent Function