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Вопрос по математике:
3 кг яблок и 2 кг 1450 тенге за грушу. Если 2 кг яблок дешевле, чем 4 кг груши на 900 тг, найдите 1 кг яблок и 1 кг стоимости груши.-
Автор:
selene
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Ответ:
Пошаговое объяснение:
1 кг яблок у
1 кг груш х
2х+3у=1450
4х-2у=900
сложим уравнения
6х+у=2350
у=2350-6х
подставим
4х-2(2350-6х)=900
4х-4700+12х=900
16х=5600
х=5600:16
х=350 тенге стоимость 1 кг груш
у=2350-6*350
у=250 тенге стоимость 1 кг яблок
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