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За 7 кг апельсинов и 4 кг лимонов заплатили 68 грн.Сколько стоит 1 кг апельсинов и сколько стоит 1 кг лимонов,если 5 кг апельсинов дороже,чем 2 кг лимонов на 17 грн.?
Решите,пожалуйста с объяснением,мозги уже вообще не работают...
Ответы 2
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хр-1грн апельсинукг-1грн лимонов{7x+4y=68{5x-2y=17/*2⇒10x-4y=34прибавим17x=102x=102:17x=6грн стоит 1 кг апельсин30-2у=172у=30-172у=13у=13:2у=6,5грн стоит 1кг лимонов
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Автор:
eduvigis - 6 лет назад
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7х + 4y = 68 5x - 2y = 17 Решение 2y = 5x - 17 7x + 2( 5x - 17 ) = 68 7x + 10x - 34 = 68 17x = 102 X = 6 ( грн ) 1 кг апельсинов 2y = 5•6 - 17 = 13 y = 6,5 ( грн ) 1 кг Лимонов
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Автор:
hoover - 6 лет назад
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