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任务9：内凹的正方形
Author:
陈丽婷
GeoGebra
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直角坐標平面上的旋轉變換
異分母分數減法
【案例】圆柱体内放置一个大球六个小球
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
Discover Resources
七巧板綜合
tube15240
Two lines
「相似三角形」任务3的副本
爱奇艺
Discover Topics
Arithmetic Mean
Continuity
Linear Equations
Confidence Interval
Unit Circle