Запиши скольким сантиметрам равна ; одна пятая часть дециметра , одна четвертая часть метра

1 дм =10 см

1 м = 100 см

1/5 дм =10: 5=2 см

1/4 м = 100: 4= 25 см

 

1) берем 24 шарика, из них 12 кладем на одну чашку весов, и 12 на другую.

возможны два случая:

а) весы уравновешены, значит, нестандартный шарик - 25-й, который мы не брали.

кладем на чашки 25-й   и любой из   24

2) взвешиваем их и определяем какой легче 25-ый нестандартный или этот один из 24 стандартных

б) весы не уравновешены, тогда

2) берем с 12 шариков с какой-либо чашки   (пусть с более тяжелой), эти шарики кладем опять на чашки весов по 6 на каждую (а с более легкой 12 шариков откладываем в сторону).

возможны следующие случаи:

а) весы уравновешены, значит нестандартный шарик остался среди 12 меньших по весу отложенных шариков и он легче остальных

б) весы не уравновешены, значит нестандартный шарик более тяжелый (т.к. мы брали шарики с более тяжелой чашки более легким он быть не может)

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