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| − | <iframe scrolling="no" title="Konstruktion einer Strecke der Länge /sqrt{7}" src="https://www.geogebra.org/material/iframe/id/qmhc5jub/width/1244/height/646/border/888888/sfsb/true/smb/false/stb/false/stbh/false/ai/false/asb/false/sri/false/rc/false/ld/false/sdz/false/ctl/false" width="1150px" height="646px" style="border:0px;"> </iframe>
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| − | <iframe src="https://learningapps.org/watch?v=ppostkufa20" style="border:0px;width:100%;height:500px" webkitallowfullscreen="true" mozallowfullscreen="true"></iframe>
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