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面鏡的反射
Author:
dunst kang
GeoGebra
New Resources
斜率的值
垂直線的斜率
三位數除以一位數（一）
祖冲之的期望：内棋与外棋
漂亮的摇摆曲线
Discover Resources
三角形數
時間參數跳躍函數
橢圓軌跡加滑桿
How tall is that?
從平均數找出數列中的其中一項數值(答案是小數)
Discover Topics
Rhombus
Matrices
Square
Integers
Arithmetic