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three-example
Author:
知己
GeoGebra
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常见四边形是否是双心四边形
第八周作业2
活动三：应用性质
百分數及其應用
斐波那契螺旋弧线（表格法）
Discover Resources
因式分解及配方法
test
動態文字多項式函數
幾何萬花筒(難度90%)
太陽系
Discover Topics
Numbers
Rhombus
Linear Functions
Cuboid
Trapezoid