Предмет: Математика, автор: vuz

Экскаватором можно выкопать за 1 ч канаву длиной 20м. Одну канаву выкопали за 10 ч, а другую за 20 ч. Какой длины канаву выкопали за это время? Решить разными способами.

Ответы

Автор ответа: uzel

если 1ч20м то,10*20=200,20*20=400,200+400=600.

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