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angles sum of a triangle 1
Author:
LAM YU SANG
GeoGebra
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第八周作业
【案例】2018年全国1卷理科12题
兩位數加法
三位數除以一位數（二）
三位數除以一位數（一）
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雙曲線
reflectional symmetry_6
兩線段和圓3
circle
畫圓周範例檔
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Congruence
Kite
Triangles
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