(sqrt(3) - sqrt(2)) ^ (3 - x) <= (sqrt(3) + sqrt(2)) ^ sqrt(x + 3). sort=корень 9^ sqrt x <=6*9^ x -5*3^ sqrt x *3^ x

Лебедев Дмитрий Сергеевич

Учитель математики

Проверено учителем

Для решения неравенств воспользуемся свойствами степеней и методами введения новой переменной. ️ Шаг 1: Решение первого неравенства Заметим, что (32)(3+2)=32=1open paren the square root of 3 end-root minus the square root of 2 end-root close paren open paren the square root of 3 end-root plus the square root of 2 end-root close paren equals 3 minus 2 equals 1 . Следовательно, 32=(3+2)-1the square root of 3 end-root minus the square root of 2 end-root equals open paren the square root of 3 end-root plus the square root of 2 end-root close paren to the negative 1 power . Перепишем неравенство: ((3+2)-1)3x(3+2)x+3open paren open paren the square root of 3 end-root plus the square root of 2 end-root close paren to the negative 1 power close paren raised to the 3 minus x power is less than or equal to open paren the square root of 3 end-root plus the square root of 2 end-root close paren raised to the the square root of x plus 3 end-root power (3+2)x3(3+2)x+3open paren the square root of 3 end-root plus the square root of 2 end-root close paren raised to the x minus 3 power is less than or equal to open paren the square root of 3 end-root plus the square root of 2 end-root close paren raised to the the square root of x plus 3 end-root power . Так как основание 3+2>1the square root of 3 end-root plus the square root of 2 end-root is greater than 1 , неравенство сохраняется для показателей: x3x+3x minus 3 is less than or equal to the square root of x plus 3 end-root Определим область допустимых значений (ОДЗ): x+30x-3x plus 3 is greater than or equal to 0 implies x is greater than or equal to negative 3. Рассмотрим два случая:

  1. Если x3<0x minus 3 is less than 0 (т. е. -3x<3negative 3 is less than or equal to x is less than 3), левая часть отрицательна, а правая неотрицательна. Неравенство верно для всех x[-3,3)x is an element of open bracket negative 3 comma 3 close paren. Если x30x minus 3 is greater than or equal to 0 (т. е. x3x is greater than or equal to 3), возведем обе части в квадрат:
    x26x+9x+3x27x+60x squared minus 6 x plus 9 is less than or equal to x plus 3 implies x squared minus 7 x plus 6 is less than or equal to 0.
    Корни уравнения x27x+6=0x squared minus 7 x plus 6 equals 0: x1=1,x2=6x sub 1 equals 1 comma x sub 2 equals 6. Решение: x[1,6]x is an element of open bracket 1 comma 6 close bracket.
    С учетом условия x3x is greater than or equal to 3, получаем x[3,6]x is an element of open bracket 3 comma 6 close bracket.
    Объединяя случаи, получаем x[-3,6]x is an element of open bracket negative 3 comma 6 close bracket.

️ Шаг 2: Решение второго неравенства Рассмотрим неравенство 9x69x53x3x9 raised to the the square root of x end-root power is less than or equal to 6 center dot 9 to the x-th power minus 5 center dot 3 raised to the the square root of x end-root power center dot 3 to the x-th power . Перепишем его в виде: 32x632x53x+x3 raised to the 2 the square root of x end-root power is less than or equal to 6 center dot 3 raised to the 2 x power minus 5 center dot 3 raised to the the square root of x end-root plus x power Разделим обе части на 32x>03 raised to the 2 x power is greater than 0: 32x32x+53x+x32x60the fraction with numerator 3 raised to the 2 the square root of x end-root power and denominator 3 raised to the 2 x power end-fraction plus 5 center dot the fraction with numerator 3 raised to the the square root of x end-root plus x power and denominator 3 raised to the 2 x power end-fraction minus 6 is less than or equal to 0 (3xx)2+53xx60open paren 3 raised to the the square root of x end-root minus x power close paren squared plus 5 center dot 3 raised to the the square root of x end-root minus x power minus 6 is less than or equal to 0 Пусть t=3xxt equals 3 raised to the the square root of x end-root minus x power , где t>0t is greater than 0. Тогда: t2+5t60t squared plus 5 t minus 6 is less than or equal to 0 Корни квадратного трехчлена: t1=-6,t2=1t sub 1 equals negative 6 comma t sub 2 equals 1. Решение: -6t1negative 6 is less than or equal to t is less than or equal to 1. С учетом t>0t is greater than 0, имеем 0<t10 is less than t is less than or equal to 1: 3xx30xx0xx3 raised to the the square root of x end-root minus x power is less than or equal to 3 to the 0 power implies the square root of x end-root minus x is less than or equal to 0 implies the square root of x end-root is less than or equal to x ОДЗ: x0x is greater than or equal to 0. При x0x is greater than or equal to 0 неравенство xxthe square root of x end-root is less than or equal to x выполняется при x=0x equals 0 и x1x is greater than or equal to 1. Ответ: Для первого неравенства: x \in [-3, 6]. Для второго неравенства: x \in {0} \cup [1, +\infty). Требуется ли вам объединить эти решения в общую систему или найти их пересечение?

Форма ответа

Ваш аватар