Предмет: Математика, автор: pirmagomedova871

Кружевница за 1 ч плетет 125 см кружев.Сколько времени нужно,чтобы сплести 10 дм кружев?

Ответы

Автор ответа: pandushatina

0

По логике должно подойти

Приложения:

pirmagomedova871: Я непоняла вопросительные знаки для чего

pandushatina: вопросительных знак - это переменная. можешь заменить на любую букву - х, а. это неизвестное, находится по правилу пропорции

pandushatina: извини, тебе наверное другое больше подойдет, если вы не проходили пропорцию.

pandushatina: 125:60 = 25/12 - это скорость, то, сколько она плетет за 1 минуту.
10 дм = 100 см
100:25/12 = (100х12)/25 = 4х12 = 48 минут потребуется, чтобы сплести 10 дм кружев.
100 и 25 там сократились.
надеюсь, теперь понятнее)

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