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Author:
凉 清
GeoGebra
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兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
兩組對邊相等的四邊形
第八周作业
異分母分數減法
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多項式函數
http://www.qsir.org/?p=8853
test
Sorting Geometric Figures
百變糖果棒
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Mathematics
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Equilateral Triangles
Linear Regression
Statistics