х/у=0,2 >>> у/х=1/0,2 >>> у/х=5
(4х-9у)/х = 4х/х–9у/х = 4-9у/х
у/х=5 >>> 9у/х=9*(у/х) >>> 9у/х=9*5=45
4-9у/х = 4-45 = –41
Ответ: –41
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х/у=0,2 >>> у/х=1/0,2 >>> у/х=5
(4х-9у)/х = 4х/х–9у/х = 4-9у/х
у/х=5 >>> 9у/х=9*(у/х) >>> 9у/х=9*5=45
4-9у/х = 4-45 = –41
Ответ: –41