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2014-10-13T19:43:16+03:00
=3·4√3-5√3+1/7·7√3=
12√3-5√3+1/49√3=7√3+1/49√3=(7·49·3+1)/49√3=1029/49√3=simplificam
=147/7√3=21/√3=21√3·√3/√3=7√3/3
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