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GeoGebra
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第三周作业效果演示
三角函数 的副本
斐波那契螺旋弧线（表格法-可动态调节）
常见四边形是否是双心四边形
活动三：应用性质
Discover Resources
proof SSS
雜類(Miscellaneous)
GGB研習作品
S3 Trigonometry
解三角形（１）
Discover Topics
Distributions
Definite Integral
Differential Calculus
Rotation
LCM and GCD