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第4课
Author:
943008912
GeoGebra
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画直线等分三角形的面积
三位數除以一位數（二）
兩組對邊相等的四邊形
判斷球體
兩組對邊相等和有直角的四邊形
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以量角器量度角
animation for kastin
立體形體 - (18)正方體的表面積計算
SIN伸縮平移
銳角三角：sin, cos
Discover Topics
Diagrams
Probability
Integral Calculus
Cosine
Arithmetic Mean