Предмет: Математика, автор: alinochko

Прошу!!!! Очень надо!!!!
1) в книге 270 страниц. 1/3 всей книги составляют рассказы о животных, 4/9 книги- рассказы о птицах, оставшаяся часть книги- рассказы о насекомых. Сколько страниц приходится на рассказы о насекомых?
2) найди число, если 2/5 этого числа рёвы 12/15.

Ответы

Автор ответа: sedinalana

1
270*1/3=90стр рассказы о животных
270*4/9=120стр рассказы о птицах
90+120=210стр о птицах и животных
270-210=60стр рассказы о насекомых
2
Целое по части находится делением
12/15:2/5=12/15*5/2=2

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