Question

Розвязком системи рівнянь {5x+2y=18. x-3y=7. Є пара чисел А) 0 ;9. Б) 2;4 В) 4;-1 Г) 6 ;-6 Смотреть ответ matilda17562 matilda17562 Ответ: В) (4;-1) является решением системы. Пошаговое объяснение: А) (0 ;9) не является решением системы. {5•0+2•9=18, - верно. {0-3•9 = 7. - неверно. Б) (2;4) не является решением системы. {5•2+2•4=18 - верно. {2-3•4=7 - неверно. В) (4;-1) является решением системы. {5•4+2•(-1)=18 - верно. {4-3•(-1)=7 - верно. Г) (6 ;-6) не является решением системы. {5•6+2•(-6)=18 - верно. {6-3(-6)=7 - неверно. 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 . Вы можете указать условия хранения и доступ к cookies в своем браузере. 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Answer 1

Давайте спростимо даний дріб:

$\frac{2p+10}{p^2+10p+25}$

Для цього можемо спробувати розкласти чисельник та знаменник на множники:

$2p+10 = 2(p+5)$ $p^2+10p+25 = (p+5)(p+5)$

Тепер можемо записати дріб з урахуванням розкладу:

$\frac{2p+10}{p^2+10p+25} = \frac{2(p+5)}{(p+5)(p+5)}$

Зверніть увагу, що в чисельнику та знаменнику присутній спільний множник $p+5$. Його можна спростити:

$\frac{2(p+5)}{(p+5)(p+5)} = \frac{2}{p+5}$

Отже, спрощений вираз дорівнює $\frac{2}{p+5}$.

Тепер перейдемо до інших питань:

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?

Нехай $x$ - кількість гектарів, засіяних у вівторок. Тоді у понеділок засіяно $x - 27.3$ га, а в середу - $\frac{x}{1.4}$ га.

Загальна кількість засіяних гектарів:

$x + (x - 27.3) + \frac{x}{1.4} = 127.4$

Помножимо все на 1.4, щоб позбутися дробового числа:

$1.4x + 1.4x - 38.22 + x = 178.36$ $3.4x = 216.58$ $x = \frac{216.58}{3.4} \approx 63.705$

Отже, було засіяно приблизно 63.705 гектарів.

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 гектарів становило.

Позначимо кількість пакетів загального борошна $x$. Тоді маємо наступне рівняння:

$x = 15 + 58$ $x = 73$

Отже, загальна кількість пакетів борошна становить 73. З них 58 пакетів є пшеничним борошном, а решта (73 - 58) - це інші види борошна.