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osazienko
osazienko
17.03.2021 07:40 •  Математика

Language focus S+HAVE\HAS+ V3 . 1 Complete the sentences with the correct form of the verbs in brackets. Use the present perfect.

0 I ’vehad (have) Italian food lots of times – it’s delicious!

1 Sam and Tom (read) all the Harry Potter books.

2 Emma (meet) a lot of famous people because she’s a journalist.

3 My dad (not win) the lottery.

4 I (not do) my homework this evening.

5 I (climb) up the Eiffel Tower

Vocabulary

2.Underline the correct answer.

0 It’s easy to hurt / crash your legs and feet playing football.

1 You mustn’t lift very heavy things as you can cut / hurt your back.

2 How did you break / fall your leg?

3 Josh cuts / falls off his bike quite often!

4 Mum cut / broke her finger while she was using a sharp knife.

5 Dan didn’t want to hurt / crash the car on his first driving lesson!

Reading

Read the article about dangerous sports

Why risk it all?

What makes some people do incredibly dangerous sports? I prefer to watch sport from the comfort of my own armchair, so I’ve often asked that question. I think there are as many answers as there are people.Everyone has seen the thrill of the bungee jump:the image of someone at the top of a very high

bridge while they’re waiting to throw themselvesoff. But why would any normal person decide to do something so dangerous? Well, clearly, there

are many people who simply enjoy the danger. If bungee jumping is a once-in-a-lifetime thrill, what about doing a dangerous sport for a

living? There’s no way I’d ever do that! Look at Formula One, for example. It’s true that motor racing is much safer than it used to be – but you

never know.

But everydaysports can sometimes be as dangerous as sports like motor racing. There are often accidents as a result of horse riding and rugby, for example, but they are popular with thousands of people in the UK. In fact, I played

rugby a lot when I was younger, and there were lots of accidents during every match! Luckily none of them were serious, though. But for me personally, the most frightening sport of all is skydiving. I can’t imagine wanting to jump

out of an aeroplane. They say moving towards the Earth at high speed is the most amazing feeling.Then when your parachute opens, you come down

gently. I’d love to know what that feels like, but I know I never will. It’s the ‘when your parachute opens’ bit that scares me. What if it do sports. It’s the ‘what if’ factor

Are the sentences True (T) or False (F)?

0 Jamie knows why some people like doing dangerous sports. F

1 Some people find bungee jumping exciting.

2 Jamie would like to have a job in motor racing.

3 Jamie thinks that horse riding is a popular but dangerous sport.

4 Jamie once took part in rugby matches.

5 Jamie has used a parachute to jump o​

👇
Ответ:
lenahalezina
lenahalezina
17.03.2021

243з58нщ42лкрццкобуегд5ш3з63щхэкнщлцкнкцлр2з47цш4элеюыжкгфд4гдгкф4шжцщ46кгдцнзушщ472лнкцдугез5ш2з752358зз752щ64лн14цклнцдкгеугджншуз5шуз5ш3дг5угд2453шзд5г3лн42о1кнпйуттврц

4,6(77 оценок)
Открыть все ответы
Ответ:
mayyyyyyka
mayyyyyyka
17.03.2021
Пусть первое число x, второе y. Причём, т.к. АП убывающая, x<y. Тогда разность прогрессии d = y-x, а третий член прогрессии равен y+d = y+y-x = 2y-x. Их сумма равна 63, то есть
x+y+2y-x = 63
3y = 63
y = 21.
Второй член АП 21, третий 2*21-x = 42-x

Если к первому числу прибавить 10,  получим (x+10) - первый член ГП; если ко второму прибавить 3, получим 21+3 = 24 - второй член ГП. Третий член ГП 42-x. Частное второго и первого, и третьего и второго - знаменатель ГП, то есть
24/(x+10) = (42-x)/24
(x+10)(42-x) = 576
-x^2+32x+420 = 576
x^2-32x-420 = -576
x^2-32x+156 = 0
D = 1024-4*156 = 400 = (20)^2
x1 = (32-20)/2 = 12/2 = 6
x2 = (32+20)/2 = 52/2 = 26 - не подходит.
Первый член АП 6, третий 42-6 = 36.

ответ: 6, 21, 36.
4,4(53 оценок)
Ответ:
Nataliaroy
Nataliaroy
17.03.2021
1. 5,707+8,293=14
14-5,784=8,216
8,216+6,5=14,716
14,716-8=6,716
6,716+1,384=8,1

2.15,09-5=10,09
10,09+6,91=17
17-9,684=7,316
7,316+3,615=10,931
10,931-2,731=8,2

3. 9-3,543=5,457
5,457+0,543=6
6-5,3=0,7
0,7-0,3=0,4
0,4+0,5=0,9
9,2-0,9=8,3

4.28,046 -4,774=23,272
23,272+8,228=31,5
31,5-30=1,5
1,5+0,5=2
2-1,8=0,2
8,6-0,2=8,4

5. 2,25+6,95=9,2
2-1,326=0,674
15,2-9,2=6
6-1,334=4,666
4,666+3,16=7,826
7,826+0,674=8,5

6. 6,36+0,9=7,26
8-6,033=1,967
1,967-0,967=1
2,27+0,07=2,34
2,34+7,26=9,6
9,6-1=8,6

7. 32,671-7,82=24,851
24,851-7,99=16,861
0,103+0,758=0,861
3,3+4=7,3
16,861-0,861=16
16-7,3=8,7

8. 6-2,189=3,811
3,811-0,711= 3,1
3,1+0,9=4
13,81-5,41=8,40
8,40-4=4,40
4,40+4,4=8,8
4,4(55 оценок)
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