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同底等高的三角形面积相等.许兴华数学
Author:
许兴华数学
Topic:
Triangles
GeoGebra
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正方形雪花图案
盈利與虧蝕
直線的斜率：水平變化 & 鉛垂變化
圓的基本性質
双心四边形
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this is math pic
Quiz on Partial Variation 部分變：測驗
正弦定理的验证
星形工具(1060724)
中國火柴遊戲二的副本
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Rectangle
Random Experiments
Quadrilaterals
Pie Chart or Circle Chart
Stochastic Process or Random Process