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利用单位圆生成y=sin（x）在[0,2pi]的图象
Author:
孙琰
GeoGebra
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找出對稱軸
異分母分數減法
三位數除以一位數（二）
算柱 (兩位數)
兩位數加法
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找動矩形的軌跡
Scheimpflug image
彩色斜線區域1060325
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
三视图积木
Discover Topics
Circle
Multiplication
Inequalities
Mode
Linear Equations