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三角形內角和

Author:李春培

三角形內角和

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找出對稱軸
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
四邊形的特性
兩位數加法

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龍騰4_1-1講段8
ppppp
ghk106a18 三角形的外心與正方形
標準分解式2
平面鏡多次成像_for_mobile

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Means
Quadratic Functions
Tangent Function
Secant Line or Secant
Orthocenter

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