Предмет: Алгебра, автор: befine99

решите уравнение 3х^+5х-2=0

Ответы

Автор ответа: MrFireman
0
d=49
x1= -1/3
x2= -2
вроде так
Автор ответа: ichihidekazu
0
3x^2+5x-2=0
Д=25-4*3*(-2)=25+24=49
x1=-5+7/6=2/6=1/3
x2=-5-7/6=-12/6=-2
Предыдущий вопрос
Следующий вопрос
Интересные вопросы
Предмет: Английский язык, автор: ajtikulovdalilser
помагите пажалуйста​
6 лет назад
Предмет: Русский язык, автор: JohnJefferson
Помогите пожалуйста, дам 55 баллов!
​
6 лет назад
Предмет: Английский язык, автор: DmitrySoloviov
Read the text and write the letter of the missing sentence in each gap. There is one sentence you don’t need to use.
(Задание: Прочитайте текст и впишите буквы отсутствующего предложения в каждый пробел. Есть одно предложение, которое не нужно использовать.)

Polar Bear Makes the List
In spring 2008, the polar bear was placed on the endangered species list. According to the Endangered Species Act, an endangered species is an animal that is likely to face extinction in its natural habitat. (9)_________ The ESA defines a threatened species as one that is likely to become "endangered" in the foreseeable future.
The polar bear is the first animal that has been classified as endangered due primarily to global warming. (10)_________ Heating homes, driving cars, and burning garbage all require fossil fuels that lead to global warming.
The polar bear's habitat is more vulnerable to global warming than many other species. Polar bears live mainly on the sea ice in the Arctic. This is where they hunt for fish and build up fat reserves. (11)_________ In the Arctic, global warming is causing the ice to melt slightly earlier and form slightly later. This results in a shorter feeding season for the polar bear. Some risk their lives to find ice. If they have to swim too far they will drown from exhaustion and hunger. The World Wildlife Fund estimates that 25% of the Arctic sea ice has disappeared in the past 30 years.
It is not only the polar bear that is at risk in the Arctic. Every species of plant, animal, and insect there is threatened by global warming. (12)_________ The Arctic food chain relies on the polar bear.
In addition, donations are more commonly offered for the protection of large animals such as bears or elephants. People in general are less interested in conservation efforts that protect small wildlife, such as plants or insects. However, by using donor money to protect the habitat of the larger animals (ex. reforestation programs), entire ecosystems can be protected.
It is important that animals such as the polar bear make it onto the endangered species list. Once they are on the list there are laws that protect these animals from being hunted for food or sport. Agencies also receive money and tools to protect the habitat and recover the species. (13)_________ Since the Endangered Species Act was introduced in the US in 1973; many species have been taken off the list due to increased populations. In fact, it is rare for a species to go extinct after they make the list. Sadly many species do go extinct while waiting for consideration.

A. Polar bears have been categorized as a "threatened" species.
B. The goal of removing the animal from the list is often achievable.
C. Global warming is caused by carbon dioxide and other greenhouse gases that become trapped in the atmosphere.
D. The future of an endangered species such as the polar bear is unknown.
E. Nevertheless, environmentalist groups such as the World Wildlife Fund often study large carnivores in order to assess the health of an ecosystem.
F. When the ice melts many polar bears move to land and live off their stored fat.
6 лет назад
Предмет: Математика, автор: яфывапролджэ
на елку повесили 48 соломенных снежинок звезд в 2 раза меньше чем снежинок  а фигурок  животных  в 3 раза меньще чем звезд  сколько всего соломеных  игрушек украшало елку?
10 лет назад
Предмет: Математика, автор: virtuallife
В 7 одинаковых ящиках 56 кг винограда. Магазин заказал 80 кг винограда. Сколько ящиков надо отправить в магазин?
10 лет назад