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Bekky14
@Bekky14
July 2022
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Как сделать номер 5?
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dnepr1
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5) Сложим два уравнения:
(1/(х+у)) + (3/(х+у) = 4,
(4/(х+у) = 4,
(1/(х+у) = 1,
х+у = 1,
х = 1 - у. Подставим в первое уравнение.
(1/(1-у+у)) - (5/(1-у-у)) = 2.
1 - (5/(1-2у)) = 2,
1-2у-5 = 2-4у,
2у = 6,
у = 6/2 = 3,
х = 1-3 = -2.
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Answers & Comments
Verified answer
5) Сложим два уравнения:(1/(х+у)) + (3/(х+у) = 4,
(4/(х+у) = 4,
(1/(х+у) = 1,
х+у = 1,
х = 1 - у. Подставим в первое уравнение.
(1/(1-у+у)) - (5/(1-у-у)) = 2.
1 - (5/(1-2у)) = 2,
1-2у-5 = 2-4у,
2у = 6,
у = 6/2 = 3,
х = 1-3 = -2.