Предмет: Математика, автор: LeraandTom

помогите пожалуйста

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Автор ответа: aigul091

1

1)680-290=390 - страниц во 2-ой книге
2)390÷2=195 - страниц в в 3-ей книге
3)680+390+195=1265 - страниц
Ответ: в трёх книгах было 1265 страниц

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