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过圆上一点作切线,三步
Author:
u.jianwang
GeoGebra
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兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
画直线等分三角形的面积
球体的体积推导(优化版)
【案例】2013年安徽高考15题
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初三作业
數線的繪製
P63-2
三角形的垂心
正方形折纸减去两角
Discover Topics
Logarithm
Logic
Trigonometric Functions
Right Triangles
Rational Numbers