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版本5
Author:
zbzhen
GeoGebra
New Resources
百分數及其應用
平行線的判定
第八周作业3
龙形曲线-分形龙2
异形操场
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賺賠：例3
isosceles triangle construction
Spiral Polyskelion
勝者即正義
第八周的作业
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Fractions
Upper and Lower Sum or Riemann Sum
Optimization Problems
Perimeter
Derivative