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lunhsin
GeoGebra
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【案例】2018年全国1卷理科12题
sanjiaohanshu
球體建築師
兩組對邊相等的四邊形
柱體建築師
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過圓內一點最短弦
橢圓
五形面體 序
Angles in a Circle:Property 2
绕圆旋转004
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Difference and Slope
Combinatorics
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Triangles