Предмет: Математика, автор: CactusBonny

номер 11 помогите! умоляю!!! :'(

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Автор ответа: mmb1

1) 1/9+1/10=10/90+9/90=19/90 две трубы за минуту
1/3*19/90=19/270 за треть минуты
2. 2/3*36=24 марки в альбом
осталось 36-24=12
1/4*12=3 марки подарил

Автор ответа: CactusBonny

спасибо :-D

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