Вопрос школьника по предмету Математика
При каких значениях X разность 5X — 15,4 и — 8,9 равна 22,5
Ответ учителя по предмету Математика
Пошаговое объяснение:Объяснение:
Для решения данной задачи необходимо следующее неравенство:
(В первом случае)
(3x-1)/2-(1+5x)/4<0
{домножаем числитель и знаменатель первой дроби на 2}
(6x-2-1-5х)/4<0
или
6х-2-1-5х<0;
x-3<0;
x<3 ⇒ x∈(-∞;3)
(Во втором случае)
(1+5x)/4-(3x-1)/2<0
{домножаем числитель и знаменатель второй дроби на 2}
(1+5х-6х+2)/4<0
или
1+5x-6x+2<0;
-x+3<0;
x>3 ⇒x∈(3;+∞)
P.S. Прошу прощения за мою возможную «тупость», просто я не совсем поняла какая именно «разность» требуется ( судя по всему та, которая описывается в первом случае, но т.к. бывают на свете задачи разные, на «всякий пожарный» я решила и вторым способом решить). Если Вас это только больше запутало, извините и просто перепишите «первый случай».
Похожие вопросы от пользователей
The flight several times last week.
was cancel
was cancelled
has been cancelled
cancelled
2
The buttons on a coat yesterday.
were sewn
were being sewn
was sewn
have was sewn
3
The teacher to very attentively while he was explaining a new rule.
was being listened
has listening
was listened
was listening
4
The answer yet.
wasn’t being given
hasn’t gave
hasn’t been given
wasn’t given
5
The dessert when they came.
was serving
was being served
has being served
was served
УКАЖИТЕ ВЕРНЫЙ ОТВЕТ
On the 23rd of May, 1909 a monument to Alexander III was opened in the center of present day Vosstaniya square. At that time the square was called Znamenskaya. Tsar Alexander III started to build the Great Siberian Railroad which connected the capital and the far East. That’s why the monument was erected in front of the Nickolaevsky Rrailway station. Now it is called Moscovsky. The monument was designed by Italian sculptor Paolo Nrubetskoy who was known for his talented sculptures. But the monument to Alexander III made him famous all over the world. After the revolution of 1917 a poem by Demyan Bedny “Scarecrow” was carved on the pedestal. In 1937 the monument was moved to the yard of the Russian Museum, where it was kept for many years. Now it stands near the Marble palace which is the part of the Russian Museum.
1. What could you see in Vosstanya Square before 1917?
2. Who designed the monument to Alexander III?
3. Where was Paolo Trubetskoy from?
4. What museum kept the monument for long years?
5. Where is the monument to Alexander III now?