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Author:
chen mingchuan
GeoGebra
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判斷球體
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
三位數除以一位數（一）
Discover Resources
正立方體->菱形十二面體(滑桿動畫)
angle between 2 planes 01
指数函数性质和图象平移
翰林數學_2下_CH3-2_SAS作圖
半圆的滚动
Discover Topics
Confidence Interval
Similar Triangles
Quadratic Functions
Ratios
Random Variables