Предмет: Математика, автор: yakovlevavikul

Помогите пожалуйста
Один из катетов прямоугольного прямоугольника меньше другого на 7 см,а гипотенуза равна 13 Найдите длину каждого катета

Ответы

Автор ответа: ZøøM
0
Если Вы имеете ввиду прямоугольный треугольник:
x - 1й катет, (x+7) - 2й катет.
По теореме Пифагора:
x^2+(x+7)^2=13^2
x^2+x^2+14x+49=169
2x^2+14x-120=0
D=196+4*120*2=1156=34^2
x1=(-14+34)/4=5
x2<0, а длина не может быть отрицательной => 1й катет=5см, а второй 5+7=13см
Ответик: 5см и 7см.
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Reading

  Read the text. Then match the topics with the paragraphs of the text.

/introduction/ packaging recycling rubbish    transport waste
 
 
 
Paragraph 1       introduction
Paragraph 2                                                        
Paragraph 3                                                        
Paragraph 4                                                        
Paragraph 5                                                        
Paragraph 6                                                        

A guide to saving the environment –
five top tips
1   We all want to reduce our impact on the environment. What practical things can we do which will make a difference?
2   Cars, motorcycles and planes all cause a lot of pollution. Try to walk or cycle. It’s also good exercise.
3   We throw away a lot of things which we can use again. Did you know that recycling one tin can save enough energy to power a television for three hours?
4   We throw away a third of all the food we buy. At least half of the food which we throw away is fresh and we could eat it.
5   Buy things which don’t have a lot of packaging. Governments are trying to make supermarkets reduce their packaging, but progress is slow.
6   Bottles and cans in the streets look horrible, but they are also an environmental problem. Use the bins.​