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Автор - prettypushkova

Найдите значение х, если
3х = 4у = 5z и
1/х + 1/у + 1/z = 2

Ответ

Автор - ЮлЯшКа123454321

frac{1}{x}+frac{1}{y}+frac{1}{z} = 2

3x = 4y → y = frac{3x}{4}

3x = 5z → z = frac{3x}{5}

frac{1}{x}+frac{4}{3x}+frac{5}{3x} = 2

frac{3}{3x}+frac{4}{3x}+frac{5}{3x} = 2

frac{12}{3x} = 2

frac{4}{x} = 2

x = 2

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