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20181227
Author:
34黃安慈
GeoGebra
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判斷球體
三位數除以一位數（一）
第八周作业
兩位數除以一位數（一）
錐體建築師
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Locus
畫三角形 題1b
Lagrange
體積的量度 1
图形的放大与缩小.许兴华数学
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Triangles
Ratios
Parallelogram
Symmetry
Sine