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http://www.qsir.org/?p=8853
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http://www.qsir.org/?p=8853
GeoGebra
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畫出對稱圖形
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
柱體建築師
Discover Resources
第一冊
多項式函數
九點圓的真正面貌
转网页后文字排版变乱
九點圓
Discover Topics
Line Segment
Integers
Step Functions
Bar Chart or Bar Graph
Triangles