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Author:
李怡
GeoGebra
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Nested spiral octagon
長方體平面投影 (Codex版)
Fibonacci Clock
sanjiaohanshu
近似值:有效數字
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柱體
曲面
transformation_reflection
周长相等,正方形,长方形和正三角形,圆面积大小比较
加減乘除运算 出题器【有数字键盘】
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Percentages
Natural Numbers
Sine
Sequences and Series
Power Functions