chữ chị lớp 9 mà đều thế ạ

Nâng cao và phát triển toán Vũ Hữu Bình .
Tập 1 - BĐT 
:3

n à? đề đâu?

16. There were many people in the theater. I couldn’t find the seat.
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17. She was very short. She couldn’t reach the tops of the high shelves.
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18. He was very disappointed. He committed a suicide.
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19. His sudden appearance gave her a great surprise. She burst out crying.
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20. I had a lot of trouble with my schoolwork. I had to ask for help. 
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21. There were a lot of questions on the test. I couldn’t finish it in half an hour.
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22. The children took a large bite of sandwich. He couldn’t chew it.
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23. It was a delicious dessert. I decided to order portion. 
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24. It was a strong wind. It blew down several banyan trees in this village.
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25. There were many people in the hall. We couldn’t see Professor Taylor.
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26. The atmosphere was suffocating. Nobody could resist the temptation to go to the seaside.
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27. He lives far from the office. He often gets up early to catch the bus to go to work on time.
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28. There were very few students at the extra class. It was cancelled. 
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??? what bài nào cơ?

OoO ToT

https://lazi.vn/uploads/edu/exercise/1505311489_8.jpg

Dễ thây \(\beta=2\alpha\)

Ta co:

\(\left(sin\alpha+cos\alpha\right)^2=sin^2\alpha+cos^2\alpha+2sin\alpha.cos\alpha=1+2sin\left(2\alpha\right)=1+2sin\beta\)

Bài 1:

a, \(\dfrac{2}{3}\) + \(\dfrac{1}{5}\). \(\dfrac{10}{7}\)

= \(\dfrac{2}{3}\) + \(\dfrac{2}{7}\) 

= \(\dfrac{20}{21}\)

b, \(\dfrac{7}{12}\) - \(\dfrac{27}{7}\). \(\dfrac{1}{18}\)

= \(\dfrac{7}{12}\) - \(\dfrac{3}{14}\)

= \(\dfrac{31}{84}\)

c, \(\dfrac{3}{10}\). \(\dfrac{-5}{6}\) - \(\dfrac{1}{8}\)

= - \(\dfrac{1}{4}\) - \(\dfrac{1}{8}\)

= - \(\dfrac{3}{8}\)

d, - \(\dfrac{4}{9}\): \(\dfrac{8}{3}\) + \(\dfrac{1}{18}\)

= - \(\dfrac{1}{6}\) + \(\dfrac{1}{18}\)

= - \(\dfrac{1}{9}\)

e,  {[(\(\dfrac{1}{2}\) - \(\dfrac{2}{3}\))² : 2 ] - 1}. \(\dfrac{4}{5}\)

= {[ (-\(\dfrac{1}{6}\))² : 2] - 1}. \(\dfrac{4}{5}\)

= { [\(\dfrac{1}{36}\) : 2] - 1}. \(\dfrac{4}{5}\)

= { \(\dfrac{1}{72}\) - 1}. \(\dfrac{4}{5}\)

=- \(\dfrac{71}{72}\).\(\dfrac{4}{5}\)

= -\(\dfrac{71}{90}\)

g, [(\(\dfrac{32}{25}\) +1): \(\dfrac{2}{3}\)].(\(\dfrac{3}{4}\) - \(\dfrac{1}{8}\))²

= [ \(\dfrac{57}{25}\) : \(\dfrac{2}{3}\)].(\(\dfrac{5}{8}\))²

= \(\dfrac{171}{50}\). \(\dfrac{25}{64}\)

= \(\dfrac{171}{28}\)

Một buổi sáng bỗng nhiên ba gọi em lại để hỏi về việc học tập của em trong học kì qua

Ba em nói :

học kì qua con học thế nào ?

Em trả lời là :

con vẫn học tốt 

Ba em lại hỏi :

thế có bị ít điểm không

Em nói rằng :

dạ không ạ ,con lúc nào cũng được 9 hoặc 10 cả

Ba em lại nói:

Thế thì tốt, nhưng con chớ có chủ quan. Phải luôn luôn siêng năng cần mẫn vì siêng năng, cần mẫn là đức tính hàng đầu mà mỗi học sinh phải có.

Em nói :

dạ vâng ạ
 

2 đề lun?

toán lớp 4 hay văn lớp 4 vậy em