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直角三角形內外重垂心
Author:
ginwha
GeoGebra
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柱體建築師
錐體建築師
兩位數加法
兩組對邊相等的四邊形
兩位數除以一位數（一）
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二次函數的觀察
How to reconstruct a quadrilateral farm to a triangular one with the same area?
area 面積3
拋物線四-平行四邊形法
黄冈中考16题(扇形滚动)
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Square
Rational Numbers
Sphere
Normal Distribution
Terms