Предмет: Математика, автор: DEMONNIGA

Задача 1 На первой полке стояло 25 книг. Это на 7 книг меньше чем на второй полке и на 7 книг больше чем на третьей полке. Сколько книг стояло на трех полках вместе

Задача 2 в комнате находилось несколько человек. Сначала вышли 3 человека и вошли 5 потом вышли 7 человек и вошли 9 и в комнате стало 42 человека. Сколько человек было в комнате первоначально

Ответы

Автор ответа: тто

1) 25+7=32 кн-стояло на второй полке
2) 25-7=18 кн-стояло на третьей полке
3)25+32+18=75 кн-стояло на трех полках
Ответ:75 книг
======================
1)5-3=2ч-
2) 9-7=2 ч-
3) 2+2=4
4) 42-4=38-было первоначально
Ответ:38 человек

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