М
Молодежь
К
Компьютеры-и-электроника
Д
Дом-и-сад
С
Стиль-и-уход-за-собой
П
Праздники-и-традиции
Т
Транспорт
П
Путешествия
С
Семейная-жизнь
Ф
Философия-и-религия
Б
Без категории
М
Мир-работы
Х
Хобби-и-рукоделие
И
Искусство-и-развлечения
В
Взаимоотношения
З
Здоровье
К
Кулинария-и-гостеприимство
Ф
Финансы-и-бизнес
П
Питомцы-и-животные
О
Образование
О
Образование-и-коммуникации
Леся059
Леся059
02.04.2020 21:39 •  Математика

Сократите дробь а) 36/48 б)40/64 в) 4×15/5×16

👇
Ответ:
Stupidpeoplenamber1
Stupidpeoplenamber1
02.04.2020
А) 36/48 = 182/4 = 9/12 = 3/4 = 0,75
б) 40/64 = 20/32 = 10/16 = 5/8 = 0,625
в) 4×15/5×16 = 60/80 = 6/8 = 3/4 = 0,75
4,4(91 оценок)
Открыть все ответы
Ответ:
astasevbogdanp08dn2
astasevbogdanp08dn2
02.04.2020

Пошаговое объяснение:

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

мSorry, I didn't understand anything

мSorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

Sorry, I didn't understand anything

4,7(20 оценок)
Ответ:

Пошаговое объяснение:

2*4^x-3*10^x=5*25^x

Разделим правую и левую части на 25^x. Получим

 

    4^x                  10^x

2     -     3   = 5

   25^x                  25^x

 

Так как степени у числетелей и знаменателей одинаковые можно поступить следующим образом

2* (4 : 25)^х  -  3*(10 : 25)^х = 5

Во второй дроби можно сократить 10 и 25 на 5. Получаем

 

2* (4 : 25)^х  -  3*(2 : 5)^х = 5

 

Так как 4 = 2^2, a 25 = 5^2, получим следующее

 

2* (2 : 5)^2х  -  3*(2 : 5)^х = 5

 

Введем новую переменную t = (2 : 5)^х

Получим новое уравнение

2*t^2  - 3*t = 5

2*t^2  - 3*t - 5 = 0

Решаем через дискриминант. a = 2, b = -3, c = -5

D = b^2 -4ac = 9 - 4*2*(-5) = 9 + 40 = 49

t(1) = (3 - 7) : 4 = -1

t(2) = (3 + 7) : 4 = 2,5

 

x = -1 нам не подходит, так как ни при каких х (2 : 5)^х не будет отрицательным.

Тогда получаем

 

(2 : 5)^х = t(2)

 

(2 : 5)^х = 5 : 2

 

(2 : 5)^х = (2 : 5)^(-1)

 

х = -1

 

ответ: х = -12*4^x-3*10^x=5*25^x

Разделим правую и левую части на 25^x. Получим

 

    4^x                  10^x

2     -     3   = 5

   25^x                  25^x

 

Так как степени у числетелей и знаменателей одинаковые можно поступить следующим образом

2* (4 : 25)^х  -  3*(10 : 25)^х = 5

Во второй дроби можно сократить 10 и 25 на 5. Получаем

 

2* (4 : 25)^х  -  3*(2 : 5)^х = 5

 

Так как 4 = 2^2, a 25 = 5^2, получим следующее

 

2* (2 : 5)^2х  -  3*(2 : 5)^х = 5

 

Введем новую переменную t = (2 : 5)^х

Получим новое уравнение

2*t^2  - 3*t = 5

2*t^2  - 3*t - 5 = 0

Решаем через дискриминант. a = 2, b = -3, c = -5

D = b^2 -4ac = 9 - 4*2*(-5) = 9 + 40 = 49

t(1) = (3 - 7) : 4 = -1

t(2) = (3 + 7) : 4 = 2,5

 

x = -1 нам не подходит, так как ни при каких х (2 : 5)^х не будет отрицательным.

Тогда получаем

 

(2 : 5)^х = t(2)

 

(2 : 5)^х = 5 : 2

 

(2 : 5)^х = (2 : 5)^(-1)

 

х = -1

 

ответ: х = -12*4^x-3*10^x=5*25^x

Разделим правую и левую части на 25^x. Получим

 

    4^x                  10^x

2     -     3   = 5

   25^x                  25^x

 

Так как степени у числетелей и знаменателей одинаковые можно поступить следующим образом

2* (4 : 25)^х  -  3*(10 : 25)^х = 5

Во второй дроби можно сократить 10 и 25 на 5. Получаем

 

2* (4 : 25)^х  -  3*(2 : 5)^х = 5

 

Так как 4 = 2^2, a 25 = 5^2, получим следующее

 

2* (2 : 5)^2х  -  3*(2 : 5)^х = 5

 

Введем новую переменную t = (2 : 5)^х

Получим новое уравнение

2*t^2  - 3*t = 5

2*t^2  - 3*t - 5 = 0

Решаем через дискриминант. a = 2, b = -3, c = -5

D = b^2 -4ac = 9 - 4*2*(-5) = 9 + 40 = 49

t(1) = (3 - 7) : 4 = -1

t(2) = (3 + 7) : 4 = 2,5

 

x = -1 нам не подходит, так как ни при каких х (2 : 5)^х не будет отрицательным.

Тогда получаем

 

(2 : 5)^х = t(2)

 

(2 : 5)^х = 5 : 2

 

(2 : 5)^х = (2 : 5)^(-1)

 

х = -1

 

ответ: х = -1

4,5(4 оценок)
Это интересно:
Новые ответы от MOGZ: Математика
logo
Вход Регистрация
Что ты хочешь узнать?
Спроси Mozg
Открыть лучший ответ