9.Difference

10.Visitors

câu 3 sai r cấu trúc như sau : 

S+tobe+used to+Ving/Noun

1.to buy

2.wash

3.staying

4.to finish

5.to finish

6.to go

7.play

8.telling-to tell

9.be

10.to get

1. I_______ate dinner_______last weekend.

2. I_______went to school_______last weekend.

3. I didn't_____hang out_____last weekend.

4. I didn't_____play games_____last weekend.

Số vải còn lại là : 

\(1-\dfrac{2}{5}-\dfrac{4}{8}\) = \(\dfrac{1}{10}\)

=> Số vải ban đầu là :

54 : \(\dfrac{1}{10}\) = 540 (m)

Exercise 1: Write at, in or on to complete these sentences.
1.  I'll see you _____on______ Monday.
2. I met him _____in______the holidays.
3. I'll pick you up _____at______eight o'clock.
4. I'm going home _____at______ four.
5. They came to visit us_____on ______ my birthday.
6. I can work ______in_____ the morning but I don't like working
night.
7. Did you have a good time ______at_____ Christmas?
8. School finishes ____at_______ three o'clock _____on______ Thursdays.
9. We arranged to meet _____at______ seven ______in_____ the morning.
10. We had a party ______on_____ the last day of the course.
11. I often go skiing ______in_____ winter.
12. What time do you get back ______on_____ Tuesday?
13. She's going to visit her parents ______at_____ Easter.
14. He was born _____on______ 8th June 1968.
15. Stuart can come and see you ______at_____ lunchtime.
16. I always send my wife flowers ______on_____ our wedding anniversary.
17. The conference is ______in_____ July.

CMR : A=2n²+3n² +n chia hết cho 6 với ∀ x ϵ Z 

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