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ptcc trigo level 2
Author:
Cheung Wing Chuen
GeoGebra
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【案例】2018年全国1卷理科12题
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
四邊形的特性
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梯形
捷徑問題
多邊形面積(分割法)
正四面體變菱形12面體
榔头和它的展开图
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