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兩條直線垂直應用
Author:
2021mbcs1gd
GeoGebra
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兩位數加法
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
找出對稱軸
【案例】2018年全国1卷理科12题
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IMO2015D
繡曲線
中考考题旋转全等的探究-4
随机模拟实验（撒豆子估算π）的副本
Fraction(2)
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Statistics
LCM and GCD
Indefinite Integral
Line Segment
Planes