Предмет: Алгебра, автор: Ymnicaaaaaaaaaaaaa

Найдите значение выражения
1)x²-16x+64/x-8 при =5,1
2)y²-100/y+10 y при=2,5

Ответы

Автор ответа: Evgenia4836
0
Решение во вложении:
Приложения:
Автор ответа: Оностосия1
0
1) D=256-256=0
x=16/2=8
значит (x-8)*(x-8) / x-8 = x-8
подставляем
5,1-8=-2.9

2) (y-10)(y+10) / y+10 = y-10
2,5-10= - 7,5
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7TH FORM. TEST 2
READING
I. Read the dialogue again and mark the statements as True, False or Not stated
Anna: Have you watched the news?
Christine: Not yet, what happened?
Anna: There was a crime rate report of our city.
Christine: Oh, really? Has it increased?
Anna: Yes! And I want to install a new alarm system because there are a lot of burglars now.
Christine: It's reasonable. And be careful with your keys. You shouldn't leave them near the open window.
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Christine: Welcome! My husband is very careful. He taught me what to do.
Anna: Can you share with me?
Christine: Sure! Here are some rules:
• check your chain on the door;
• don't forget to look through your peephole;
• don't let strangers in and always check their ID;
• take your mobile phone with you to the bedroom and switch it on.
Anna: Thank you so much! These rules are really simple.
Christine: Yes! So, it's easy to follow them. You know, better safe than sorry.
1. Anna wanted to install a new alarm system because her old one is broken.
2. There are a lot of burglars in the city where women live.
3. Christine's husband told her never to sleep with the switched on mobile phone.
4. According to Christine's husband, you should never open the door to strangers.
5. It's wise to be careful in big cities, where crime rate is high.
VOCABULARY
II. Complete the sentences with the correct word.
Ugly – scar – cute – curly – slim - in her forties
1. The Wicked Witch was so __________________ . So she scared me.
2. She is on a diet. She wants to be__________________ .
3. My aunt looks like a teenager. But she is __________________ .
4. My little sister is so__________________ in this picture.
5. When I was a teenager, I had straight blond hair. Now I have dark__________________ hair.
6. Last summer I fell from my bike and I have a small ________________ on my leg.
III. Circle the odd word out.
1. bald – young – teenager – elderly
2. scared – relieved – shocked – frightened
3. intelligent – clever – brilliant – artistic
4. slim – freckles – plump – well-built
5. round – fair – dark – curly
6. ordinary – typical – incredible – usual

GRAMMAR
IV. Put the word in correct form.
1. John was very_______________ (tire) after the football match.
2. I was really_______________ (bore) watching that film.
3. Helen is_______________ (scare) of snakes.
4. Mum said she was really_______________ (disappoint) in us.
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1. Larry _______________ (play) computer games while his brother _______________ (chat) with a friend yesterday evening.
2. Bob _______________ (begin) to be interested in programming when he _______________ (be) 9.
3. A: Why _______________ you_______________ (not come) to the party last Saturday?
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5. William Shakespeare often ____________ (act) in his own plays.
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