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Ответ

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lorimkfly

Ответ:

Рaвc= AB+BC+AC

КN, NM, MK- средние линии треугольника. Значит,

Pкнм=KN+NM+MK=

0.5AB+0.5BC+0.5AC=

=0.5(AB+BC+AC)=AB+BC+AC/2

Соответственно, Pкнм=Рaвc:2

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