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工具：PlaneArrows, PlaneText... (v.2)
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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四邉形 (四年級) 教師版
【案例】2018年全国1卷理科12题
拼砌四邊形
異分母分數減法
三位數除以一位數（二）
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Task1
日光平行光
與三半圓相切之圓填色
test for fun的副本
轨迹最值问题
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Variance
Root
Statistical Characteristics
Linear Regression
Cone