Question

Розв'яжіть способом додавання систему рівнянь{3x+ 5y= 1,{4x-5y= -22.​ Смотреть ответ didmoroz35 didmoroz35 Ответ: (-3;2) Пошаговое объяснение: {3x+ 5y= 1, + {4x-5y= -22.​ 7x=-21 x=-3 3x+ 5y= 1 -9+5y=1 5y=10 y=2 Новые вопросы в Математика Cкоротіть дріб 30 БАЛЛОВ!!!!!!!!!!!!!!!!!!!!!!!!!! [tex]2p+10/p^2+10p+25[/tex] 2. У понеділок засіяли 127,4 га поля, у вівторок - на 27,3 га більше, а в середу - у 1,4 рази менше, ніж у вівторок. Скільки всього гектарів було засі … яно? У магазині за день продали 15 пакетів із борошном, що становило всіх наявних пакетів борошна. Пшеничного борошна в магазині було 58 пакетів, а решта г … речане. Скільки пакетів гречаного борошна було в магазині? Відповідь: П Борошно 1. Знайди середнє арифметичне чисел: 3,91; 9,18, 7,8; 15,35, тa округли його до десятих​ 6. Знайди значення виразу: 7,2-3,8+(3,24-2,1312): 0,42​ Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . 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Answer 1

Давайте розглянемо ваші питання:

1. Скоротіть дріб: Почнемо зі спрощення виразу: $\frac{2p+10}{p^2+10p+25}$ Спрощуємо чисельник: 2p + 10 Спрощуємо знаменник, спочатку розв'язавши квадратне рівняння $p^2+10p+25=0$. $p^2 + 10p + 25 = (p+5)(p+5) = (p+5)^2$ Тепер можемо переписати вираз: $\frac{2p+10}{(p+5)^2}$ Тепер застосуємо розділення на спрощення: $\frac{2(p+5)}{(p+5)^2}$ Тепер, оскільки ми маємо однакові множники у чисельнику та знаменнику, можемо скоротити їх: $= \frac{2}{p+5}$

2. У понеділок засіяли 127,4 га поля, у вівторок - на 27,3 га більше, а в середу - у 1,4 рази менше, ніж у вівторок. Скільки всього гектарів було засіяно? У понеділок засіяли 127,4 га поля. У вівторок засіяли на 27,3 га більше: 127,4 + 27,3 = 154,7 га. У середу засіяли на 1,4 рази менше, ніж у вівторок: 154,7 / 1,4 = 110,5 га. Всього було засіяно: 127,4 + 154,7 + 110,5 = 392,6 га.

3. У магазині за день продали 15 пакетів із борошном, що становило всіх наявних пакетів борошна. Пшеничного борошна в магазині було 58 пакетів, а решта гречаного. Скільки пакетів гречаного борошна було в магазині? Нехай x - кількість пакетів гречаного борошна. Тоді загальна кількість пакетів борошна дорівнює 58 + x. За умовою, продали 15 пакетів, тому маємо рівняння: 58 + x = 15 Переносимо 58 на другий бік рівняння: x = 15 - 58 x = -43 Відповідь: В магазині було 43 пакети гречаного борошна.

4. Знайди середнє арифметичне чисел: 3,91; 9,18, 7,8; 15,35, та округли його до десятих. Середнє арифметичне чисел знаходимо, додавши всі числа і поділивши на їх кількість (у цьому випадку 4, оскільки ми маємо 4 числа): (3.91 + 9.18 + 7.8 + 15.35) / 4 = 36.24 / 4 = 9.06 Отже, середнє арифметичне цих чисел дорівнює 9.06 (до двох десятих).

5. Знайди значення виразу: 7.2 - 3.8 + (3.24 - 2.1312) / 0.42 Проводимо операції в дужках: 7.2 - 3.8 + (3.24 - 2.1312) / 0.42 = 7.2 - 3.8 + 1.1088 / 0.42 Ділимо 1.1088 на 0.42: 7.2 - 3.8 + 1.1088 / 0.42 = 7.2 - 3.8 + 2.6400 Знаходимо різницю 7.2 і 3.8: 7.2 - 3.8 + 2.6400 = 3.4 + 2.6400 Додаємо 3.4 і 2.6400: 3.4 + 2.6400 = 6.0400 Отже, значення виразу дорівнює 6.0400.