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圓錐截痕
Author:
洪宜慧
GeoGebra
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柱體建築師
【案例】2018年全国1卷理科12题
画直线等分三角形的面积
拼砌四邊形
四邉形 (四年級) 教師版
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四邊形四個西姆松圓交於九點心
button
test05
推移（x 方向）的副本
淘宝网
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Parabola
Vectors
Optimization Problems
Frequency Distribution
Fractions