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angle between planes
Author:
johnmayhk
GeoGebra
New Resources
球體建築師
異分母分數減法
算柱 (兩位數)
【案例】2018年全国1卷理科12题
第八周作业
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三條線上的正三角形
畢氏定理動態證明(歐基里得，平形四邊形等面積2，應用時間參數跳躍函數配合向量)
test
三角形的三线
S0G4L2 到两点距离的运算为定值
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Limits
Arithmetic
Linear Equations
Statistics
Trigonometry