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Ex_77
Author:
早苗雅史
GeoGebra
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standingwave
standingwave-reflection-free
standingwave-reflection-fixed
standingwave-plus
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分数の表し方
六角格子の面積は？
平行六面体parallelepiped
東大2018理系3
感覚と数（正三角形らしく見えますか？）
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Statistics
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Rotation