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x^(4*logx(a))=x^logx(a4)=a4 a^(3+5*loga(x))=a3*x5 ([$8730$]x)^(10+2*x*logx(a))=x5*ax f(x)=(a5*ax+a3*x5-ax*x5-a8)-1/2=(ax*(a5-x5)-a3*(a5-x5))-1/2=((a5-x5)*(ax-a3))-1/2 Видно, что при x=a и при a=1 функция не определена (a5-x5)*(ax-a3) > 0 (подкоренное выражение) Получим две системы: |a5-x5 < 0 |ax-a3 < 0
|a5-x5 > 0 |ax-a3 > 0
при a<1 (a>0 как аргумент логарифма) из первой системы получим область (-[$8734$];a)[$8745$](-[$8734$];3)=(-[$8734$];a) из второй системы получим область (a;[$8734$]+)[$8745$](3;[$8734$]+)=(3;[$8734$]+) в этих интервалах число целых значений x больше 3
при a>1 из первой системы получим область (a;3) - число целых значений x меньше 3 из второй системы получим область (3;a) при 7<a<8 получим интервал (3;a), содержащий 3 целых значения x (4;5;6) Ответ: (7;8)
5
Неизвестный
17.04.2010, 01:54
общий
это ответ
Здравствуйте, Болдырев Тимофей.
из определения функции сразу накладываются ограничения: 1. х > 0, так как стоит под радикалом и 2. x!=1, так как стоит в основании логарифма. 3. выражение с больших скобках должно быть строго положительным, так как стоит под радикалом и в знаменателе.
4. кроме того а всегда положительно, так как стоит под логарифмом. и не равно 1 как по пункту 2.
Далее, преобразовываем выражение в больших скобках (используя основное логарифмическое тождество a^log_a(x) = x и x^log_x(a) = a. А также свойства логарифма 5log_a(x) = log_a(x^5), x*log_x(a) = log_x(a^x)) (выражение в скобках)= a^(x+1)*x^(log_x(a^4)) + a^3*a^(log_a(x^5)) - x^5*x^log_x(a^x)-a^8 = a^(x+1)*a^4 + a^3*x^5 - x^5*a^x - a^8 = a^x*a^5 - x^5*a^x + a^3*x^5 - a^8 = a^x*(a^5 - x^5) - a^3*(a^5 - x^5) = (a^5 - x^5) * (a^x - a^3)
согласно пункту 3 это выражение должно быть строго положительным. (a^5 - x^5) * (a^x - a^3) > 0 (*) это случится когда либо обе скобки положительны, либо обе скобки отрицательны.
Предположим, что обе скобки отрицательны, тогда I.1 при а > 1 имеем x > a и x < 3. Но по пунктам 1. и 2. х>0 и x!=1. Т.е. из целых чисел подходит максимум только одно х=2, если а < 2. Мало! I.2 при a < 1 имеем x > a и x > 3. Здесь у (*) решений много, так как х при любом значении а не ограничен сверху.
Предположим, что обе скобки положительны: II.1 при а > 1 имеем x < a и x > 3. Тогда мы будем иметь в области определения три целых x=4,5,6 если a \in (7, 8] II.2 при a < 1 имеем x < a и x < 3. Тогда x < 1 и (*) вообще не имеет целочисленных решений.
Таким образом все случаи рассмотренны.
Ответ даёт пункт II.1: 7 < a <= 8
Удачи!
5
Неизвестный
17.04.2010, 01:58
общий
2Лиджи-Гаряев Владимир: эх, опередил но, a=8 тоже подходит, так как x строго меньше а.
Неизвестный
17.04.2010, 11:34
общий
Лиджи-Гаряев Владимир: Здравствуйте! Может я, конечно, и ошибаюсь, но по-моему должно быть 6 < a <= 7, ведь, если у нас будет промежуток, например, (3; 6.5), то он будет включать 3 целых числа: 4, 5, 6. А если, как вы написали, 7 < a <= 8, то промежуток может быть, например, (3; 7.5) и он будет включать уже 4 целых числа(4,5,6,7).
Неизвестный
17.04.2010, 11:58
общий
ну да, конечно! должно быть 6 < a <= 7.
но ошибка только в утверждении II.1 даже скорее очепятка... было уже поздно....спать было охота....
спасибо!
Неизвестный
17.04.2010, 12:15
общий
Болдырев Тимофей: Здравствуйте!
Действительно, я ошибся при определении интервала для a. Правильный ответ: (6;7]
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