Сатып алынған дәптер саны а, қалам саны Ыболсын. 25 - a + 6:b <1700 теңсіздігі
100. Дәптердің бағасы 48 тг, қаламның баға​

1,8/3,6=0,5

x/(x+6)=0,5

x=6

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1,8/3,6=0,5

x/(x+6)=0,5

x=6

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