Предмет: Геометрия, автор: KenjiZaksune

Точки A, B и C лежат на одной прямой, точки M и N середины отрезков AB и AC. Докажите что ВС=2MN

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Автор ответа: mma0509

0

АВ < АС,тогда АМ < АN, BC=AC-AB=2AN-2AM=2(AN-AM)=2MN

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