$\frac{x+3}{x-3}-\frac{x-3}{x+3}=\frac{18}{x^2-9}$

I. Choose the word whose underlined part is pronounced differently from that of the others.

1. A. pool
B. cool
C. root
D. wood
2. A. hurry
B. sure
C. during
D. curious
3. A. village
B. disagree
C. message
D. cottage
4. A. open
B. contact
C. office
D. college
5. A. truth
B. include
C. full
D. rule
II. Choose the word that has different stress pattern.

1. A. ‘ensure
B. ‘collect
C. ‘upload
D. har’vest
2. A. re’lation
B. ‘cultural
C. bas’ketball
D. coun’tryside
3. A. ex’pectation
B. ‘activity
C. par’ticipate
D. deve’lopment
4. A. ‘professional
B. ‘convenient
C. infor’mation
D. ‘community
5. A. con’centrate
B. ‘connection
C. ‘notify
D. ‘practical

V. Choose the best answer to complete the sentences.

1. Nowadays, many youngsters spend hours ________________ the net on smartphones. 

A. connecting B. surfing C. emailing D. blogging

2. My brother is still crazy ________________ both his work and his hobbies. 

A. in B. on C. of D. about

3. This app works well for small group communication and ________________ friends and family. 

A. messaging B. posting C. loading D. logging

4. Willy ________________ playing football and doing exercise, so he looks sporty. 

A. dislikes B. hates C. fancies D. detests

5. Weaving and knitting are ________________ cottage industries in many rural areas. 

A. vast B. traditional C. peaceful D. picturesque

6. ________________ a website describes when a person reads through the web pages on the Internet. 

A. Checking B. Browsing C. Logging in D. Downloading

7. The farmers grow crops and ________________ cattle and poultry for their own use. 

A. herd B. harvest C. keep D. raise

8. The rural western regions are generally less ________________ than the urbanized east coast areas. 

A. simple B. basic C. developed D. complicated

9. They ________________ the fields and scatter the good seed on the land. 

A. plough B. catch C. dry D. feed

10. The beauty of this village scenery is ________________, and you can’t find it anywhere else. 

A. unique B. diverse C. popular D. common

Bỏ ngoặc ra rồi tính các tổng:
$\frac{39}{5}+\left(\frac{9}{4}-\frac{9}{6}\right)-\left(\frac{5}{4}+\frac{6}{7}\right)=??????$

1. The ________________ traffic is a continual annoyance to the citizens in the city. (noise)

2. Do you know the man who invented the combine ________________? (harvest)

3. The team was very ________________ of each other, so our project was a big success. (support)

4. A special bus transported a group of ________________ from the airport to a hotel. (tour) 

5. I shall be ________________ in receiving your comments on my posts. (interest)

6. More and more people entered and the train was ________________. (crowd)

7. ________________ cows by hand was the way people did for thousands of years. (milk)

8. In the rural areas, hospitals and markets are far-away - it’s ________________. (convenience)

9. The students are working under extreme ________________ at the moment. (press)

10. They are living ________________ in the countryside at the current time. (peace)

5x + 5X+1 + 5x+2 = 31

giai ho

(25x²y - 13xy² + y³) - A = 11 x²y - 2 y³

$\frac{x+3}{x-3}-\frac{x-3}{x+3}=\frac{18}{x^2-9}$

(2x - 3)² - (x - 1)²  = 0 (tìm x)

Một người đi xe đạp khởi hành từ A với vận tốc 13km/h, đuổi theo một người đi bộ khởi hành từ B. Hai người khởi hành cùng một lúc và sau 1 giờ 30 phút thì gặp nhau. Hỏi:

a, Quảng đường từ A tới B dài bao nhiêu?

b,Khi hai người gặp nhau cách b bao nhiêu?Biết vận tốc người đi bộ là 5km/h.
 ko sao chép nhé ạ

$\frac{2}{3}\times \frac{5}{2}-\frac{3}{4}\times \frac{2}{3}$

Cho hệ phương trình: $\left\{\begin{array}{l}2x+y=m+1\\ mx-2y=5\end{array}\right.$
a) Tìm m để hệ phương trình có nghiệm (x;y) = (1;2)
b) Khi m = 2 hãy giải hệ phương trình

 Bài 3 : Tính hợp lí

a) 12 x 194 +6 x 437 x 2 + 3 x 369 x4

_______________________________

1+5+9+13+.....+57+61+65x2 - 26

b) 26 x 13 + 74 x14

_________________

1374 x 57 +687 x 86

c) ( 44 x 52 x 60 ) : ( 11 x 13 x 15 )

d) 124 x 237 + 152 

____________________________

870 +235 x 122

a) $\frac{38}{5}-\left(\frac{19}{7}+\frac{28}{5}\right)$

b) $\frac{58}{7}-\left(\frac{31}{9}+\frac{30}{7}\right)$

c) $\frac{19}{9}-\left(\frac{38}{9}-\frac{11}{2}\right)$
d) $\frac{235}{11}-\left(\frac{8}{5}+\frac{81}{11}\right)$
e) $\frac{143}{13}-\left(\frac{18}{7}+\frac{68}{13}\right)$
g) $\left(\frac{58}{9}+\frac{40}{11}\right)-\frac{40}{9}$
I) $\left(\frac{71}{9}+\frac{29}{13}\right)-\frac{44}{9}$
f) $\frac{143}{13}-\left(\frac{18}{7}+\frac{68}{13}\right)$

I.Supply the correct form of the word given in each sentence.

1.__________is increasingly driven by a growing worldwide demand for different globally-traded commodities,including soy, palm oil, beef and tinber.(FOREST)

2.__________fish which are found some distance from coastlines or islands fall into four classes: bony fish with ray fins, cartilaginous fish, jawless fish and bony fish with lobe fins.(OCEAN)

3.The salt __________as the water evaporates.(CRYSTAL)

4.Located between Nepal and Tibet, Mount Everest has attracted may climbers, including highly

experienced __________.(MOUNTAIN)

5.Millions of wild flowers color the valleys__________in April and May.(SPECIAL)

6.I could see no sign of life in this__________town.It used to be a military base in the 17th century.(DESERT)

rút gọn tính giá trị biểu thức tại x - 2013, A = 2x(10x² - 5x - 2 ) - 5x (4x² - 2x - 1)

Giải hệ phương trình sau
$\left\{\begin{array}{l}3x+y=0\\ x+2y=5\end{array}\right.$