Предмет: Математика, автор: elizamustafina

сколько досок длиной 2 м ,шириной 10 см и толщиной 25 мм выйдет из бруса длиной 60 дм имеющего в сечении прямоугольник размером 40 см× 50см?

Ответы

Автор ответа: DominikUser3
1
как бы я рассуждал:
60 дм = 6м,значит брус можно распилить на 6/2=3 равные частипо 2 м длиной,ну как раз,как наши доски.
 теперь рассмотрим сечения бруса и доски
площадь сечения бруса=40*50=2000см²
площадь сечения доски 10*2,5=25см²  ( где 25мм=2,5см)
теперь узнаем сколько досок получится из одной части бруска
2000см²:25см²=80штук
 а у нас таких брусков три значит всего получится 80*3=240 доски

elizamustafina: спасибо)))
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