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三節棍的軌跡
Author:
lunhsin
GeoGebra
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兩組對邊相等的四邊形
拼砌四邊形
柱體建築師
判斷球體
【案例】2018年全国1卷理科12题
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平行線的性質
正弦定理的验证
Tiling 2
B3C2-2例6-1
長方形的周界與長和闊的關係 (教師版)
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Arithmetic Operations
Algebra
Rhombus
Dilation
Natural Numbers