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20170308
Author:
CDOMA7
GeoGebra
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拼砌四邊形
兩組對邊相等和有直角的四邊形
球體建築師
画直线等分三角形的面积
四邉形 (四年級) 教師版
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量度活動所用的時間 (時、分、秒)
圓柱的截面
長方形分割
堆垛
三角形相似的直观显示.许兴华数学
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Median Line
LCM and GCD
Logarithm
Ratios
Complex Numbers