Помогите решить уравнения и неравенства. 1) 6^2x+11=216 2)(1/9)^3-x=3^x+8 3) 4^x+2+4^x-1=260 4) 25^x-8*5^x+15=0 5) 11^x2+4x-5=1 6) (1/8)^4x+9 знак больше или равно 64^5-x 7)2^7x-12 знак меньше 8^x+1 8) 5^x2-3x-2 знак меньше или равно 25 9) 9^x+1+9^x знак больше 810 10) (2/3)^2x-10 знак меньше или равно 8/27

Лебедев Дмитрий Сергеевич

Учитель математики

Проверено учителем

Ниже представлены решения десяти уравнений и неравенств. ️ Шаг 1: Решение уравнения 1 Уравнение: 62x+11=2166 raised to the 2 x plus 11 power equals 216 Представим число 216216 как степень с основанием 66: 216=63216 equals 6 cubed. Получаем: 62x+11=636 raised to the 2 x plus 11 power equals 6 cubed. Так как основания равны, приравниваем показатели: 2x+11=32 x plus 11 equals 3. 2x=311=-82 x equals 3 minus 11 equals negative 8. x=-4x equals negative 4. ️ Шаг 2: Решение уравнения 2 Уравнение: (1/9)3x=3x+8open paren 1 / 9 close paren raised to the 3 minus x power equals 3 raised to the x plus 8 power Приведем к основанию 33: (3-2)3x=3x+8open paren 3 to the negative 2 power close paren raised to the 3 minus x power equals 3 raised to the x plus 8 power. Используя свойство степеней: 3-6+2x=3x+83 raised to the negative 6 plus 2 x power equals 3 raised to the x plus 8 power. Приравниваем показатели: -6+2x=x+8negative 6 plus 2 x equals x plus 8. 2xx=8+62 x minus x equals 8 plus 6. x=14x equals 14. ️ Шаг 3: Решение уравнения 3 Уравнение: 4x+2+4x1=2604 raised to the x plus 2 power plus 4 raised to the x minus 1 power equals 260 Вынесем общий множитель 4x14 raised to the x minus 1 power за скобки: 4x1(43+1)=2604 raised to the x minus 1 power center dot open paren 4 cubed plus 1 close paren equals 260. 4x1(64+1)=2604 raised to the x minus 1 power center dot open paren 64 plus 1 close paren equals 260. 4x165=2604 raised to the x minus 1 power center dot 65 equals 260. 4x1=260/65=44 raised to the x minus 1 power equals 260 / 65 equals 4. 4x1=414 raised to the x minus 1 power equals 4 to the first power. x1=1x=2x minus 1 equals 1 ⟹ x equals 2. ️ Шаг 4: Решение уравнения 4 Уравнение: 25x85x+15=025 to the x-th power minus 8 center dot 5 to the x-th power plus 15 equals 0 Пусть 5x=t5 to the x-th power equals t, где t>0t is greater than 0. Тогда 25x=t225 to the x-th power equals t squared. t28t+15=0t squared minus 8 t plus 15 equals 0. По теореме Виета: t1=3,t2=5t sub 1 equals 3 comma t sub 2 equals 5. Обратная замена:

  1. 5x=3x=log535 to the x-th power equals 3 ⟹ x equals log base 5 of 3. 5x=5x=15 to the x-th power equals 5 ⟹ x equals 1.

️ Шаг 5: Решение уравнения 5 Уравнение: 11x2+4x5=111 raised to the exponent x squared plus 4 x minus 5 end-exponent equals 1 Так как 1=1101 equals 11 to the 0 power, то: x2+4x5=0x squared plus 4 x minus 5 equals 0. Корни квадратного уравнения по теореме Виета: x1=-5,x2=1x sub 1 equals negative 5 comma x sub 2 equals 1. ️ Шаг 6: Решение неравенства 6 Неравенство: (1/8)4x+9645xopen paren 1 / 8 close paren raised to the 4 x plus 9 power is greater than or equal to 64 raised to the 5 minus x power Приведем к основанию 22: (2-3)4x+9(26)5xopen paren 2 to the negative 3 power close paren raised to the 4 x plus 9 power is greater than or equal to open paren 2 to the sixth power close paren raised to the 5 minus x power. 2-12x272306x2 raised to the negative 12 x minus 27 power is greater than or equal to 2 raised to the 30 minus 6 x power. Так как основание 2>12 is greater than 1, знак неравенства сохраняется: -12x27306xnegative 12 x minus 27 is greater than or equal to 30 minus 6 x. -12x+6x30+27negative 12 x plus 6 x is greater than or equal to 30 plus 27. -6x57negative 6 x is greater than or equal to 57. При делении на отрицательное число знак меняется: x-57/6x-9.5x is less than or equal to negative 57 / 6 ⟹ x is less than or equal to negative 9.5. ️ Шаг 7: Решение неравенства 7 Неравенство: 27x12<8x+12 raised to the 7 x minus 12 power is less than 8 raised to the x plus 1 power Приведем к основанию 22: 27x12<(23)x+127x12<23x+32 raised to the 7 x minus 12 power is less than open paren 2 cubed close paren raised to the x plus 1 power ⟹ 2 raised to the 7 x minus 12 power is less than 2 raised to the 3 x plus 3 power. 7x12<3x+37 x minus 12 is less than 3 x plus 3. 7x3x<3+127 x minus 3 x is less than 3 plus 12. 4x<15x<3.754 x is less than 15 ⟹ x is less than 3.75. ️ Шаг 8: Решение неравенства 8 Неравенство: 5x23x2255 raised to the exponent x squared minus 3 x minus 2 end-exponent is less than or equal to 25 5x23x252x23x225 raised to the exponent x squared minus 3 x minus 2 end-exponent is less than or equal to 5 squared ⟹ x squared minus 3 x minus 2 is less than or equal to 2. x23x40x squared minus 3 x minus 4 is less than or equal to 0. Найдем корни: x1=4,x2=-1x sub 1 equals 4 comma x sub 2 equals negative 1. Метод интервалов для параболы ветвями вверх: x[-1;4]x is an element of open bracket negative 1 ; 4 close bracket. ️ Шаг 9: Решение неравенства 9 Неравенство: 9x+1+9x>8109 raised to the x plus 1 power plus 9 to the x-th power is greater than 810 99x+9x>810109x>8109 center dot 9 to the x-th power plus 9 to the x-th power is greater than 810 ⟹ 10 center dot 9 to the x-th power is greater than 810. 9x>819x>929 to the x-th power is greater than 81 ⟹ 9 to the x-th power is greater than 9 squared. Так как 9>19 is greater than 1, то x>2x is greater than 2. ️ Шаг 10: Решение неравенства 10 Неравенство: (2/3)2x108/27open paren 2 / 3 close paren raised to the 2 x minus 10 power is less than or equal to 8 / 27 (2/3)2x10(2/3)3open paren 2 / 3 close paren raised to the 2 x minus 10 power is less than or equal to open paren 2 / 3 close paren cubed. Так как основание 0<2/3<10 is less than 2 / 3 is less than 1, при переходе к показателям знак меняется: 2x1032 x minus 10 is greater than or equal to 3. 2x13x6.52 x is greater than or equal to 13 ⟹ x is greater than or equal to 6.5. Ответ:

  1. x = -4
  2. x = 14
  3. x = 2
  4. x_1 = \log_5 3, x_2 = 1
  5. x_1 = -5, x_2 = 1
  6. x \le -9.5
  7. x < 3.75
  8. x \in [-1, 4]
  9. x > 2
  10. x \ge 6.5

Нужно ли вам графическое представление для решений неравенств или помощь с логарифмическими вычислениями для 4-го примера?

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