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19 tháng 10 2014

Thay ab+bc+ca=1 vào ta có:

(a2+ab+bc+ac)(b2+ab+ac+bc)(c2+ab+bc+ca) = [ a(a+b)+c(a+b)].[ b(a+b)+c(a+b)].[ c(a+b) +a(a+b)]

=(a+c)(a+b)(b+c)(a+b)(a+c)(b+c) = [(a+c)(a+b)(b+c)]2 là một scp.

Complete sentences 1 – 18 with idioms and other expressions from the box. a bit of a do / do as you're told/do me a good turn / do the sights / do the trick / do to a turn /do me a favour/do's and don'ts / do the dirty/ do you a world of good/ do you justice/ do your dirty work/ make do with/take some doing/ that does it/ that's done it/ the done thing/ you were done1. This steak is delicious. It's _______.2. We haven't got any coffee, I'm afraid. We'll have to __________ tea.3. The boss spent...
Đọc tiếp

Complete sentences 1 – 18 with idioms and other expressions from the box.

a bit of a do / do as you're told/do me a good turn / do the sights / do the trick / do to a turn /do me a favour/

do's and don'ts / do the dirty/ do you a world of good/ do you justice/ do your dirty work/ make do with/

take some doing/ that does it/ that's done it/ the done thing/ you were done

1. This steak is delicious. It's _______.

2. We haven't got any coffee, I'm afraid. We'll have to __________ tea.

3. The boss spent all morning writing out a list of __________ for the office.

4. __________, Harriet! One more word from you, and you can leave the room immediately!

5. We've missed our train. __________! Now we'll never get to London in time for the show.

6. You need a holiday. A break would __________.

7. That's a nice dress you're wearing, but it doesn't really __________.

8. You paid £200 for that old television? __________!

9. We're having __________ this Saturday to celebrate our anniversary.

10. If the printer doesn't work, hit it gently: that usually __________.

11. We spent a week in Paris, and __________.

12. I don't believe you sold your broken computer to Paul. How could you __________ on one of your friends like that?

13. I'm fed up __________!

14. I was wondering if you could __________. I need to borrow £20.

15. __________, Alison, or I'll send you to your room.

16. It will __________ to get all this work finished by five o'clock.

17. Jane __________ last week, and I would really like to return the favour.

18. You shouldn't argue with your teacher. It's not __________. (to be the correct or suitable thing to do)

 

Help me plz! I need it fast

0

b: Thay y=6 vào y=3x, ta được:

3x=6

hay x=2

c: Thay x=y vào y=3x, ta được:

3x=x

=>x=0

=>y=0

a: Số đo góc ở đáy là:

\(\dfrac{180^0-80^0}{2}=50^0\)

b: SỐ đo góc ở đỉnh là:

\(180^0-2\cdot80^0=20^0\)

19 tháng 2 2022

9 A
11010 B

19 tháng 2 2022

9.A

10.B

26 tháng 10 2017
Moi nguoi giup minh nha
17 tháng 8 2017

Complete the sentences with the words in parentheses.
1.A : What ( you, do)__did you do______last Friday ?
B : I ( come )_came_____to class.
2. A :What ( you,do) _will you do_____next Friday ?
B : I ( come ) __will come___to class
3.A : What ( you,do )____did you do______yesterday evening ?
B : I ( watch)__watched_____TV.
4.A :What ( you,do )___do you do_______every evening ?
B :I ( watch)____watch___TV.
5. A :What ( you,do )___will you do_______tomorrow evening ?
B :I ( watch)___will watch____TV.
6.A : What ( you, do )____are you doing__________right now ?
B : I (do)___am doing_____ a grammar exercise.
7. A :What (Maria,do)____does marian do_____every morning ?
B : She ( go )____goes____to work

17 tháng 8 2017

Complete the sentences with the words in parentheses.
1.A : What ( you, do)____did you do____last Friday ?
B : I ( come )____CAME__to class.
2. A :What ( you,do) ___DID YOU DO___next Friday ?
B : I ( come ) _CAME____to class
3.A : What ( you,do )______DID YOU DO____yesterday evening ?
B : I ( watch)____WATCHED___TV.
4.A :What ( you,do )____DO YOU DO______every evening ?
B :I ( watch)__WATCH_____TV.
5. A :What ( you,do )___WILL YOU DO_______tomorrow evening ?
B :I ( watch)____WILL WATCH___TV.
6.A : What ( you, do )______ARE YOU DOING________right now ?
B : I (do)_____AM DOING___ a grammar exercise.
7. A :What (Maria,do)___DOES MARIA DO______every morning ?
B : She ( go )_____GOES___to work

20 tháng 3 2022

giúp mình với, đi mà mọi ngườikhocroi

20 tháng 3 2022

What do you do in America, Mary?

I'm a student.

What about your dad?

He plays in a band.

What do your parents do?

My mom is a cook and my dad is a musician. 

Where do they work?

My mom works in my school.