Ответ:
379 / 5
81 - 18y + y² - y² - 8y = 81 - 26y
при y = 1/5:
81 - 26 * (1 / 5) = 81 - 26/5 = 405/5 - 26/5 = 379 / 5
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Ответ:
379 / 5
81 - 18y + y² - y² - 8y = 81 - 26y
при y = 1/5:
81 - 26 * (1 / 5) = 81 - 26/5 = 405/5 - 26/5 = 379 / 5