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mumusinka
mumusinka
13.04.2020 12:24 •  Алгебра

Найди числовое значение многочлена,

предварительно у его: c^2 10ac−10a10a^2c, если ответить!​

Показать ответ
Ответ:
Lena537837
Lena537837
07.03.2021 23:02
Будем решать в минутах:
1 час 45 минут=105 минут
1 час 15 минут=75 минут
2 часа 55 минут=175 минут
a,b,c,d - производительности 1,2,3,4 трубы
Составляем уравнения:
a+b+c=1/105
a+b+d=1/75
c+d=1/175
Будем решать систему уравнений метод сложения.То есть, складываем все левые части и приравниваем их к сумме вторых частей уравнений:
a+b+c+a+b+d+c+d=1/175+1/75+1/105
2a+2b+2c+2d=1/105+1/75+1/175
2(a+b+c+d)=1/35
a+b+c+d=1/35:2=70
Значит, если включить все 4 трубы, то бассейн заполнится за 70 минут или 1 час и 10 минут.
Такие задачи надо решать с производительности.Не в коем случае не надо складывать просто время, за которое заполнит каждая труба.Это будет ошибкой!Удачи!
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Ответ:
арсений201
арсений201
19.04.2020 03:00

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