(a + b +c )²=a²+b²+c²+2ab+2ac+2bc

Autor:Daniel Mentrard

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http://dmentrard.free.fr/GEOGEBRA/Maths/Export6/(a+b+c)%C2%B2MD.html

http://dmentrard.free.fr/GEOGEBRA/Maths/Export6/(a+b+c)%C2%B2MD.html

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