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Ответ дан
alina141929
1)сначало найдём ас по теореме Пифагора
АС в квадрате=АВ в квадрате-ВС в квадрате
АС в квадрате=121-21=100
АС=10
2)по теореме о средней линии АС=2МN
следовательно MN =5

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