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Функция f(x) имеет период 4a. Проверяется двукратным применением равенства, приведенного в условии задачи. Сначала выражаем f(x + 2a) через f(x), потом f(x + 4a) через f(x). Получим f(x + 4a) = f(x). Попробуйте посчитать, если я не ошибся, должно получиться.
откуда следует, что число является периодом функции и сама функция - периодическая.
И, по-моему, из того, что уравнение
не имеет решений для не следует ли, что является строго монотонной функцией? Если следует, то такая функция не может быть одновременно периодической и непрерывной на как я понимаю. Если этот вывод верен, то осталось обосновать его строго.
Да, f(x) не может быть непрерывной. Действительно, из выписанных Андреем Владимировичем уравнений следует, что f(x) не может принимать значения 0,1,2. Следовательно, если f(x) непрерывна, все ее значения должны лежать в одном из четырех интервалов: (-[$8734$], 0), (0, 1), (1, 2), (2, +[$8734$]). Покажем, что это невозможно. Если f(0) принадлежит интервалу (-[$8734$], 0), то, согласно 1-му уравнению, f(a)>0. Если f(0) принадлежит интервалу (0, 1), то, согласно 3-му уравнению, f(3a)<0. Если f(0) принадлежит интервалу (1, 2), то, согласно 2-му уравнению, f(2a) < 0. Если f(0) принадлежит интервалу (2, +[$8734$]), то, согласно 1-му уравнению, f(a) < 0.
Не совсем поняла Ваш вывод Если f(0) принадлежит интервалу (-∞, 0), то, согласно 1-му уравнению, f(a)>0. Если f(0) принадлежит интервалу (0, 1), то, согласно 3-му уравнению, f(3a)<0. Если f(0) принадлежит интервалу (1, 2), то, согласно 2-му уравнению, f(2a) < 0. Если f(0) принадлежит интервалу (2, +∞), то, согласно 1-му уравнению, f(a) < 0.
В последнем утверждении имеется в виду "только в одном интервале". Иначе, если f(x) непрерывна и, например, принимает значения в первом и втором интервалах, то она должна принять значение 0, разделяющее эти интервалы, что невозможно в силу уравнения 3, в котором f(x) стоит в знаменателе..
Четыре строчки, которые Вы выписали - это просто подстановки x = 0 в уравнения 1, 2, 3. Например, из уравнения 1 при х = 0 следует f(a) = 2/(2 - f(0)). Если f(0)[$8712$](-[$8734$], 0), т.е. f(x) < 0, то f(a) > 0 - а это значение лежит за пределами интервала (-[$8734$], 0).
Из уравнения f(x+a) = 2/(2 - f(x)), (1) подставляя x = x + a, получим f(x + 2a) = (2 - f(x))/(1 - f(x)). (2) Аналогично находим f(x + 3a) = 2 - 2/f(x), (3) f(x + 4a) = f(x). (4) То есть, f(x) периодична с периодом 4a.
Из уравнений (1) - (3) следует, что f(x) не может принимать значения 0,1,2. Эти точки делят числовую ось на четыре интервала: (-[$8734$], 0), (0, 1), (1, 2), (2, +[$8734$]). Если f(x) непрерывна и принимает значения, лежащие в разных интервалах, то она должна принять значения, разделяющее эти интервалы, что невозможно. Следовательно, если f(x) непрерывна, все ее значения должны лежать целиком только в одном из четырех интервалов: (-[$8734$], 0), (0, 1), (1, 2), (2, +[$8734$]).
Рассматривая уравнения (1) - (3), нетрудно заметить, что: - если f(0) принадлежит интервалу (-[$8734$], 0), то, согласно уравнению (1), f(a) > 0; - если f(0) принадлежит интервалу (0, 1), то, согласно уравнению (3), f(3a) < 0; - если f(0) принадлежит интервалу (1, 2), то, согласно уравнению (2), f(2a) < 0; - если f(0) принадлежит интервалу (2, +[$8734$]), то, согласно уравнению (1), f(a) < 0.
Следовательно, f(x) не может быть непрерывной.
5
спасибо!!!!!!!
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