по теореме косинусов:
AB²=BC*AC*cos<C
AB²=3*3√3*√3/2=27/2
AB=√(27/2)=√13.5
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по теореме косинусов:
AB²=BC*AC*cos<C
AB²=3*3√3*√3/2=27/2
AB=√(27/2)=√13.5