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長方形與正方形的面積
Author:
GeoGebra Institute of Hong Kong
點擊圖形內的空白位置，找出各圖形的面積。 長方各的面積和它的長和闊有甚麼關係？
GeoGebra Institute of Hong Kong
http://www.sites.google.com/site/hkgeogebra
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