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元旦快乐（制作：孟宝兴）
Author:
孟宝兴
GeoGebra
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【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
兩位數除以一位數（一）
球體建築師
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外心
數學傳播39卷4期, 平面幾何公式思考
Testing: addition
Is it a condition for //gram?
百分數、分數和小數互化
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Fractal Geometry
Polynomial Functions
Trigonometry
LCM and GCD
Statistics