y = \(\dfrac{a-1}{a+2}\).x + 2 là hàm số bậc nhất

<=> \(\dfrac{a-1}{a+2}\) \(\ne\) 0 

<=> a - 1 \(\ne\) 0   và a + 2 \(\ne\) 0

<=> a \(\ne\) 1  và a \(\ne\) - 2

Vậy để y \(\dfrac{a-1}{a+2}\).x + 2 là hàm số bậc nhất thì a \(\ne\) 1 và a \(\ne\) -2

A

1. donate old books to poor students in the city

2. donating money to people in a flooded area

3. helping street children

4. giving away school uniforms to poor students

5. cleaning up the school yard.

(4x+5):3-121:11=4

<=> (4x + 5) : 3 - 11 = 4

<=> (4x+5) : 3 = 4 + 11 = 15

<=> 4x + 5 = 15 . 3 

<=> 4x + 5 = 45

<=> 4x = 45 - 5 = 40

<=> x = 40 : 4 = 10

231+(312-x)=531 

<=> 312 - x = 531 - 231

<=> 312 - x = 300

<=> - x = 300 - 312

<=> - x = - 12

<=> x = 12

\(\dfrac{x}{5}\) = \(\dfrac{-2}{10}\) <=> \(\dfrac{x}{5}\) = \(\dfrac{-1}{5}\) <=> 5x = -5 <=> x = -1

Gọi số thứ nhất là a, số thứ 2 là b

Theo bài ra ta có: \(\dfrac{a}{b}\) = a+b = 1,5

a+b = 1,5 => a = 1,5 - b

\(\dfrac{a}{b}\) = 1,5 <=> \(\dfrac{1,5-b}{b}\) = 1,5 <=> 1,5 - b = 1,5b

<=> 1,5b + b = 1,5 <=> 2,5b = 1,5 <=> b = 0,6

=> a = 1,5 - 0,6 = 0,9

Vậy hai số cần tìm là 0,6 và 0,9 

4.Rearrange the words to form the meaningful sentences (1 pt)

1. from / my sister’s / is / mine / dress / different /

My sister's dress different from mine

2. was /she/ because/ late/ of/ heavy/ the/ rain

she was late because of the heavy rain

3. There / some / are / of / bottles / water / mineral / in / fridge / the/

There are some bottles of mineral water in the fridge

4. by / the house / surrounded / is /police /the/

the house is surrounded bt the police

5. Rewrite the sentences so that their meaning stays the same (1.5pts)

1. Summer is hotter than winter

-> Winter is  not as hot as summer

2. Many foreign tourists visit the Temple of Literature.

-> The Temple of Literature is visited by many foreign tourists

3. I am interested in watching TV in the evening.

-> I enjoy watching TV in the evening.

4. I think that learning English is important.

->I find learning English important

5. My brother enjoys coffee very much.

-> Coffee is my brother's favourite drink

6. What is the price of a plate of fried rice?

-> How much does a plate of fried rice cost?

Hoa cau rụng trắng ngoài hè.

Question 14. For lunch, I think we should buy _______eggs to make omelette.

A. half a dozen of                 B. half a dozen           C. half of dozen                    D. dozen

Question 15. My mother usually says , “try today, ______ you will be repentant in the future.”

A. and                                B. but                 C. or                                   D. however

Question 16. His daughter always wants to become a well-known________, but she is not good at acting at all. However, he always encourages her to try as much as possible.

A. actress                            B. acting                C. actor                               D. action

Question 17. Everyone in the room enjoyed that candidate’s performance so much that they________for five minutes.

A. applauded                        B. screamed          C. smiled                              D. raised

Question 18. My friends enjoy _______ the English Speaking club held every Sunday night by Youth Pioneers Club.

A. to take part in       B. taking part in    C. take part in           D. to taking part in

Question 19. ___________ she is really intelligent, she never has good grades at Maths.

A. Because                            B. However C. Although                           D. So