Question

{14-4х больше или равно 3(2-х) {14+(х+1) меньше или равно 8хмало времени!​ Смотреть ответ sabirzelena sabirzelena Ответ: Пошаговое объяснение: Решить систему уравнений. {14-4х≥3(2-х) {14+х+1≤8х {14-4х≥6-3х {14+х+1≤8х {-4х+3х≥6-14 {х-8х≤-14 {-х≥-8 {-7х≤-14 х≤8 х≥2 2≤х≤8 х∈[2; 8] Новые вопросы в Математика В числе 234* замените * цифрой так, чтобы полученное число: 1. делилось на 5, но не делилось на 10; 2. делилось на 6; 3. не делилось ни на 2, ни на 5 … ; 4. делилось на 2 и на 5. из всех чисел х, удовлетворяющих неравенству 1420&lt;х&lt;1435, выберите числа которые: 1. делятся на 3; 2. делятся на 9; 3. делятся на 9 и на 2; … 4. не делятся ни на 2, ни на 3 цена предмета была 80 долларов и стала 128 долларов. а) на сколько процентов подорожал этот предмет? б), на сколько процентов старая цена меньше новой … цены?​ помогите пожалуйста задание на фото Числа якої з наведених пар є взаємно простими? А 12 і 21 Б 245 і 50 В 14 і 51 Г 54 і 111 Допоможіть будь ласка! ^ ^ ( • - • )( \/ \/)— —​ Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . Вы можете указать условия хранения и доступ к cookies в своем браузере. 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Answer 1

Давайте разберемся с данным решением системы неравенств:

У нас есть два неравенства:

1. $14 - 4x \geq 3(2 - x)$
2. $14 + (x + 1) \leq 8x$

Давайте пошагово решим их:

1. Раскроем скобки в первом неравенстве:

   $14 - 4x \geq 6 - 3x$

2. Теперь выразим $x$ на одной стороне:

   $-4x + 3x \geq 6 - 14$

   $-x \geq -8$

3. Теперь умножим обе стороны на -1, но помним, что при умножении на отрицательное число, меняется направление неравенства:

   $x \leq 8$

Теперь переходим ко второму неравенству:

1. Раскроем скобки во втором неравенстве:

   $14 + x + 1 \leq 8x$

   $15 + x \leq 8x$

2. Теперь выразим $x$ на одной стороне:

   $x - 8x \geq -15$

   $-7x \geq -15$

3. Теперь поделим обе стороны на -7, но помним, что при делении на отрицательное число, меняется направление неравенства:

   $x \leq \frac{-15}{-7}$

   $x \leq \frac{15}{7}$

Теперь у нас есть два неравенства:

1. $x \leq 8$
2. $x \leq \frac{15}{7}$

Чтобы найти общее решение системы, возьмем пересечение решений этих двух неравенств:

$2 \leq x \leq 8$

Итак, общее решение системы неравенств - это интервал $2 \leq x \leq 8$, что можно записать как $x \in [2, 8]$.

Теперь ответы на ваши другие вопросы:

1. Для того чтобы найти число, которое делится на 5, но не делится на 10, можно взять число 235.

2. Чтобы число делилось на 6, оно должно быть четным и делиться на 3. Из чисел от 2 до 8 это только 6.

3. Чтобы число не делилось ни на 2, ни на 5, нужно выбрать число 7.

4. Чтобы число делилось и на 2, и на 5, нужно выбрать число 10.

5. Для чисел от 1421 до 1434:

   1. Делятся на 3: 1422, 1425, 1428, 1431, 1434.
   2. Делятся на 9: 1422, 1431.
   3. Делятся и на 9, и на 2: 1422.
   4. Не делятся ни на 2, ни на 3: 1423, 1424, 1426, 1427, 1429, 1430, 1432, 1433.

6. Для определения процента подорожания предмета, используйте следующую формулу:

   $\text{Процент подорожания} = \frac{\text{Новая цена} - \text{Старая цена}}{\text{Старая цена}} \times 100\%$

   а) $\text{Процент подорожания} = \frac{128 - 80}{80} \times 100\% = \frac{48}{80} \times 100\% = 60\%$

   б) $\text{Процент старой цены меньше новой} = \frac{80 - 128}{128} \times 100\% = \frac{-48}{128} \times 100\% = -37.5\%$

Если у вас есть еще какие-либо вопросы или нужна дополнительная помощь, пожалуйста, дайте знать!