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demidenkotanya
@demidenkotanya
June 2021
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ЗАДАЧА, АЛГЕБРА, ФОТО
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golov83at
Пусть х - скорость поезда по расписанию, тогда
36/(х+4)=36/х-1/10
360х=360(х+4)-х(х+4)
360х=360х+1440-х²-4х
х²+4х-1440=0
х=(-4±√(16+5760))/2=(-4±76)/2
х₁=-40 х₂=36
Ответ-36 км/ч
2 votes
Thanks 1
demidenkotanya
спасибушки
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Answers & Comments
36/(х+4)=36/х-1/10
360х=360(х+4)-х(х+4)
360х=360х+1440-х²-4х
х²+4х-1440=0
х=(-4±√(16+5760))/2=(-4±76)/2
х₁=-40 х₂=36
Ответ-36 км/ч