Прямая, параллельная стороне АС{"color":"#202335","fontFamily":"stix","language":"ru"} треугольника АВС{"color":"#202335","fontFamily":"stix","language":"ru"}, пересекает стороны АВ{"color":"#202335","fontFamily":"stix","language":"ru"} и ВС{"color":"#202335","fontFamily":"stix","language":"ru"} в точках М{"color":"#202335","fontFamily":"stix","language":"ru"} и N{"color":"#202335","fontFamily":"stix","language":"ru"} соответственно. Найдите BN{"color":"#202335","fontFamily":"stix","language":"ru"}, если MN=18{"color":"#202335","fontFamily":"stix","language":"ru"}, AC=42{"color":"#202335","fontFamily":"stix","language":"ru"}, NC=40{"color":"#202335","fontFamily":"stix","language":"ru"}.
