Olympiades ENSAE - 1er S 2025

  • Posted on: 8 May 2025
  • By: sbana

Exercice 1

Cet exercice est composé de parties $A$, $B$ et $C$  dans une large mesure indépendantes.
 
Partie A :

On définit par $A$ l'ensemble des fonctions $f\ :\  [0\;,1]\rightarrow \mathbb{R}$ vérifiant les conditions suivantes :

$\bullet\ $Pour tous réels $\alpha$ et $\beta\in[0\;,1]/\alpha <\beta$ si $f(\alpha)\times f(\beta)\leq 0$ alors il existe au moins $\overline{x}]\alpha\;,\beta[$ tel que $f\left(\overline{x}\right)=0$

$\bullet\ f(x)=f(1)=0$

$\bullet\ $Pour tout $x$ réel de l'intervalle $\left[0\;,\dfrac{7}{10}\right]\;,f\left(x+\dfrac{3}{10}\right)\neq f(x)$

Soit $f$ un élément de $A.$

On définit une fonction $h\ :\ \left[0\;,\dfrac{7}{10}\right]\rightarrow\;,\mathbb{R}$ donnée par : $h(x)=f\left(x+\dfrac{3}{10}\right)-f(x)$, pour tout $x\left[0\;,\dfrac{7}{10}\right]$

On suppose que h vérifie la condition $(1)$
 
$(1)$ Montrer que $h(x)$ est de signe constant sur $[0\;,\dfrac{7}{10}]$

$(2)$ Démontrer que l'équation $f(x)=0$ admet au moins sept solutions sur $[0\;,\dfrac{7}{10}]$
 
Partie B :

Les martiens sont les habitants, en nombre éventuellement infini, de la planète Mars.

Vis à vis d'eux-mêmes et de leurs semblables, les martiens sont capables de ressentir deux types d'émotions, qu'ils appellent amour et respect.

Il a été observé que :  

$\bullet\ $Chaque martien aime un et un seul martien, et respecte un et un seul martien.
 
$\bullet\ $Si $A$ aime $B$, alors tout martien qui respecte $A$ aime également $B$
 
$\bullet\ $ Si $A$ respecte $B$, alors tout martien qui aime $A$ respecte également $B.$
 
$\bullet\ $Chaque martien est aimé d'au moins un martien.  

On se propose de vérifier s'il est vrai que chaque martien respecte le martien qu'il aime.
 
Pour chaque martien $x$ , on désigne respectivement par $f(x)$ et $g(x)$ les martiens aimés et respectés par $x$

$(1)$ Montrer que les fonctions $f$ et $g$ sont bien définies de l'ensemble $X$ des martiens sur lui-même.
 
$(2)$ Montrer que $f[g(x)]=f(x)$ et $g[f(x)]=g(x)$ pour tout $x$ dans $X$
 
$(3)$ Montrer finalement que, pour tout $x$, on a $f(x)=g(x)=x$
 
$(4)$ Conclure !

Partie C :

Soit $n\in\mathbb{N}^{\ast}$, $m_{1}$, $m_{2}$, $\ldots$, $m_{n}$ des réels et $\mathrm{e}_{1}$, $\mathrm{e}_{2}$, $\ldots$, $\mathrm{e}_{n}$

des réels strictement, positifs on a :
$$\begin{array}{rcl}\dfrac{m_{1}^{2}}{\mathrm{e}_{1}}+\dfrac{m_{2}^{2}}{\mathrm{e}_{2}}+\ldots+\dfrac{m_{n}^{2}}{\mathrm{e}_{2}}\geq\dfrac{\left(m_{1}+m_{2}+\ldots+m_{n}\right)^{2}}{\mathrm{e}_{1}+\mathrm{2}+\ldots+\mathrm{e}_{n}}\end{array}$$

Cette inégalité est connue sous le nom de l'inégalité des Mauvais Élèves $(IME)$
En appliquant l'$IME$, montrer que :

$(1)$ Si $a_{1}$, $a_{2}$, $\ldots$, $a_{n}$ sont $n$ réels strictement positifs alors :

$\dfrac{1}{a_{1}}+\dfrac{1}{a_{2}}+\ldots+\dfrac{1}{a_{n}}\geq\dfrac{n^{2}}{a_{1}+a_{2}+\ldots+a_{n}}$
 
$(2)$ Si $a$, $b$ et $c$ sont $3$ réels strictement positifs alors :

$\dfrac{a}{a+2c}+\dfrac{b}{b+2a}+\dfrac{c}{c+2b}\geq 1$

$(3)$ Si $x$, $y$ et $z$ sont réels strictement positifs tels que : $\dfrac{1}{x+1}+\dfrac{1}{y+1}+\dfrac{1}{z+1}=1$ alors $xyz\geq 8$

On considère la figure suivante où $ABMN$ et $ARSC$ sont des carrés construits à partir du triangle $ABC$

On construit en outre le parallélogramme $ANA'R$

1. a. Démontrer que $\left(AA'\right)$ est une hauteur du triangle $ABC$

b. Démontrer que $AA'=BC$

2. On considère les parallélogramme $NARA'$, $QBMB'$ et $SCPC'$

Justifier que $\left(AA'\right)$, $\left(BB'\right)$ et $\left(CC'\right)$ sont concourantes.

b. Démontrer que dans un triangle $ABC$, si $M$ désigne le milieu de $[BC]$ alors : $AB^{2}+ac^{2}=2\left(BM^{2}+AM^{2}\right)$ (Théorème d'Apollonius).

c. En déduire que $NR^{2}+QM^{2}+SP^{2}=3\left(AB^{2}+AC^{2}+BC^{2}\right)$

Exercice 3

$\mathbb{R}$ désigne l'ensemble des nombres réels.

Dans ce problème, on cherche à déterminer les applications $f$ définies sur $]0\ ;\ +\infty[$ et à valeurs dans $]0\ ;\ +\infty[$  vérifiant les deux propriétés suivantes :

$\bullet\ $pour tous nombres réels strictement positifs $x$ et $y$, $f[xf(y)]=yf(x)$ ;
 
$\bullet\ f$ est bornée sur $[1\ ;\ +\infty[$ il existe un nombre réel $A$ tel que pour tout nombre réel $x\geq 1$, $f|f(x)|\leq A$

Partie I

Soit $I$ un intervalle de $\mathbb{R}$ et soit $h$ une application définie sur $I$ et à valeurs dans $I$

On dit que est $h$ une involution de $I$ si pour tout nombre réel $x$ dans $I\;,h[h(x)]=x$

1. Donner un exemple d'involution de $\mathbb{R}$ dans R autre que l'identité.

2. Donner un exemple d'involution de $]0\ ;\ +\infty[$ dans $]0\ ;\ +\infty[$ autre que l'identité.   

3. Montrer qu'une involution de $I$ dans $I$ est bijective.

Partie II

Soit $f$ une fonction vérifiant les deux conditions citées au début de l'énoncé.
 
1. Soit deux nombres réels $y_{1}$, $y_{2}$ strictement positifs tels que $f\left(y_{1}\right)=f\left(y_{2}\right).$

Montrer que $y_{1}f(1)=y_{2}f(1)$

2. Montrer que $f$ est injective.
 
3. Montrer que $f[f(1)]=f(1)$ puis $f(1)$ puis que $f(1)=1$
 
4. Montrer que $f$ est une involution de $]0\ ;\ +\infty[$

5. Soient $a$ et $b$ deux réels strictement positifs.

Montrer que $f(ab)=ff(a)f(b)$

Indication : on pourra poser $b=f(y)$

Partie III

On note $F$ l'ensemble des points fixes de $f$ : $F=\lbrace x\in]0\ ;\`+\infty\left[/f(x)=x\right\rbrace$
 
1) Montrer que pour tout $x\in]0\ ;\ +\infty[\;,xf(x)$ est un élément de  $F.$

2. Montrer que $1$ est un élément de $F.$
 
3. Montrer que si $x$ et $y$ sont des éléments de $F$, alors $xy$ et $\dfrac{x}{y}$
 sont également des éléments de $F.$
 
4. Montrer que si $x$ est un élément de $F$, alors pour tout entier naturel $n$, $xn$ est un élément de $F$

5. Montrer que si $x$ est un élément de $F$, alors $x=1$

Indication : on pourra considérer l'application : $\mathbb{N}\rightarrow \mathbb{N}$ définie par $x_{n}x^{n}$

6. Montrer que $F=\lbrace 1\rbrace$
 
7. En déduire $f.$
 
8. Donner enfin toutes les applications répondant au problème posé.

 

 

Niveau: 
Classe: 
Type: 
Série: 

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Ниже представлены официальные и резервные зеркала платформы KRAKEN, которые гарантируют стабильный доступ.

<b>Список рабочих адресов KRAKEN для перехода:</b>
Основной рабочий адрес KRAKEN: https://forum.geeks-rp.ru/threads/9609/
Первое официальное зеркало KRAKEN:https://forum.geeks-rp.ru/threads/8986/
Второе резервное зеркало KRAKEN: https://forum-geeks--rp-ru.translate.goog/threads/191/?_x_tr_sl=auto&_x_...
Дополнительный домен KRAKEN для доступа: https://forum.geeks-rp.ru/threads/9616/

<b>Подробная инструкция KRAKEN по безопасному входу и использованию: </b>
Подготовка браузера для доступа к KRAKEN. Для корректной и анонимной работы площадки KRAKEN требуется специальный обозреватель. Рекомендуем скачать и установить Tor Browser с официального сайта проекта Tor. Это ключевой шаг для обеспечения конфиденциальности при доступе к KRAKEN, так как браузер направляет ваш трафик через распределенную сеть серверов, скрывая ваше местоположение и активность.
Запуск и подключение к сети для KRAKEN. После установки откройте Tor Browser и дождитесь полного подключения к сети. Иконка в верхней части окна браузера покажет статус соединения. Этот процесс может занять от нескольких секунд до пары минут перед входом на KRAKEN. Убедитесь, что подключение установлено успешно.
Переход на сайт KRAKEN. В адресной строке запущенного браузера введите один из актуальных адресов KRAKEN, указанных выше (например, <a href=></a> или <a href=></a>), и перейдите по нему. Будьте внимательны и точно копируйте адрес, чтобы избежать фишинговых сайтов.
Регистрация или авторизация на KRAKEN. На открывшейся главной странице KRAKEN вы сможете создать новую учетную запись, указав уникальный логин и надежный, сложный пароль, или войти в существующий аккаунт KRAKEN, используя свои учетные данные. Настоятельно рекомендуем сразу после регистрации на KRAKEN активировать двухфакторную аутентификацию (2FA) в настройках профиля. Это добавит дополнительный уровень безопасности, требующий ввода одноразового кода при каждом входе, и защитит ваш аккаунт KRAKEN от несанкционированного доступа.

<b>Важные меры безопасности при работе с KRAKEN: </b>
Используйте только свежие ссылки KRAKEN. Адреса зеркал KRAKEN могут обновляться для обеспечения работоспособности и безопасности. Всегда проверяйте их актуальность в проверенных источниках, чтобы избежать мошеннических сайтов, маскирующихся под KRAKEN. Не сохраняйте ссылки в закладках надолго без проверки.
Дополните анонимность VPN для доступа к KRAKEN. Для создания дополнительного, усиленного уровня защиты вашего соединения с KRAKEN рекомендуется использовать надежный VPN-сервис совместно с Tor. Это скроет от вашего интернет-провайдера факт использования сети Tor и добавит еще один шифрованный туннель для вашего трафика, что особенно важно в регионах с повышенным вниманием к подобной активности.
Проверяйте репутацию контрагентов на KRAKEN. Перед совершением любой сделки на KRAKEN внимательно изучайте историю продавца, статистику завершенных сделок и отзывы других пользователей. Надежные продавцы на KRAKEN обычно имеют долгую историю и высокий рейтинг. Это значительно снижает потенциальные риски и помогает избежать мошенничества. Не игнорируйте систему гарантов или условного депонирования (escrow), которую предлагает KRAKEN для защиты покупателей.
Критически оценивайте информацию. Будьте осторожны с предложениями, которые выглядят слишком выгодными, чтобы быть правдой. Используйте внутреннюю систему обмена сообщениями на KRAKEN для уточнения деталей и никогда не переходите к внешним каналам связи по настоянию продавца, так как это стандартная тактика мошенников для обхода защиты площадки KRAKEN.

<b>Почему пользователи выбирают площадку KRAKEN? </b>
Маркетплейс KRAKEN заслужил доверие многочисленной аудитории благодаря сочетанию ключевых факторов. Во-первых, это широкий и разнообразный ассортимент, представленный сотнями продавцов. Во-вторых, интуитивно понятный интерфейс KRAKEN, который упрощает навигацию, поиск товаров и управление заказами даже для новых пользователей. В-третьих, продуманная система безопасных транзакций, включающая механизмы разрешения споров (диспутов) и возможность использования условного депонирования, что минимизирует риски для обеих сторон сделки. На KRAKEN функциональность сочетается с внимательным отношением к безопасности клиентов, что делает процесс покупок более предсказуемым, защищенным и, как следствие, популярным среди пользователей, ценящих анонимность и надежность.

<b>Популярные поисковые запросы, связанные с доступом к KRAKEN:</b>

<b>Быстрый алгоритм действий для доступа к KRAKEN:</b>
1. Установите Tor Browser с официального сайта.
2. Откройте браузер и дождитесь успешного подключения к сети Tor.
3. В адресной строке введите актуальный адрес KRAKEN: https://forum-geeks--rp-ru.translate.goog/threads/766/?_x_tr_sl=auto&_x_...
4. Пройдите регистрацию, создав уникальный логин и сложный пароль, или авторизуйтесь в системе KRAKEN.
Немедленно включите двухфакторную аутентификацию в настройках вашего профиля KRAKEN.
Для максимальной анонимности рассмотрите возможность использования VPN-сервиса перед запуском Tor Browser.
Всегда проверяйте репутацию продавца по отзывам и рейтингу перед совершением сделки на KRAKEN.

<a href=https://forum.geeks-rp.ru/threads/5775/>кракен вход ссылка</a>
<a href=https://forum.geeks-rp.ru/threads/6539/>кракен пользователь не найден</a>
<a href=https://forum.geeks-rp.ru/threads/9616/>кракен актуальные</a>
<a href=https://forum.geeks-rp.ru/threads/6539/>кракен вход ссылка</a>
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