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特製的門 2
Author:
李春培
特製的門2
https://www.facebook.com/video.php?v=730160733696759&fref=nf
GeoGebra
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兩組對邊相等和有直角的四邊形
異分母分數減法
算柱 (兩位數)
【案例】2018年全国1卷理科12题
柱體建築師
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小二、小三_時間（學生版）
Classifying Quadrilaterals
Space-filling curve
解題二
相反数 思考（教材第10页）
Discover Topics
Interest Calculation
Triangles
Multiplication
Indefinite Integral
Integers