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五上-CP4-第三节平行四边形面积1
Author:
冉献伟
GeoGebra
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異分母分數減法
兩位數除以一位數（二）
【案例】2013年安徽高考15题
拼砌四邊形
兩組對邊相等的四邊形
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Reference Angle 參考角
Apollonius Problem 7 CCP poncelet
柱體高度與體積
circuit
ghk106a07 圓半徑與外切、外離關係
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Angles
Arithmetic Operations
Functions
Addition
Area