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1984全国文7
Author:
常振虎
GeoGebra
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兩組對邊相等的四邊形
三位數除以一位數（二）
拼砌四邊形
兩位數除以一位數（一）
【案例】2013年安徽高考15题
Discover Resources
雙曲線的軌跡
優良作品1(沛綺)
Apollonius Problem 5 CPP Inversion
day01_04
科赫雪花 (Koch Snowflake)
Discover Topics
Pythagoras or Pythagorean Theorem
Median Line
Cuboid
Stochastic Process or Random Process
Means