Предмет: Алгебра, автор: Аноним

на прокорм 8 лошадей и 15 коров отпускали ежедневно 162 кг сена сколько сена выдавали каждой лошади и каждой корове если известно что 5 лошадей получали сена на 3 кг больше сем 7 коров

Ответы

Автор ответа: tanyacool

290

х- кг для 1 лошади, у-кг для 1 коровы
система уравнений:
5х-7у=3
8х+15у=162
решаем
х=(3+7у):5
8(3+7у):5+15у=162
умножаем все части на 5
24+56у+75у=810
131у=786
у=6
х=(3+7·6):5
х=9
9кг лошади и 6 кг корове

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