a) Tìm MTC:

\(\text{2x + 6 = 2(x + 3)}\)

\(\text{x2 – 9 = (x – 3)(x + 3)}\)

\(\text{MTC = 2(x – 3)(x + 3) = 2(x2 – 9)}\)

Nhân tử phụ:

\(\text{2(x – 3)(x + 3) : 2(x + 3) = x – 3}\)

\(\text{2(x – 3)(x + 3) : (x2 – 9) = 2}\)

Qui đồng:

b) Tìm MTC:

Qua một mùa dịch dài và khó khăn , cuối cùng cũng được đến trường . Em cảm thấy rất vui và phấn chấn . Vừa mới quay lại trường như vừa mới đón một làn gió đông mới . Được gặp bạn bè nên ai cũng vui , em cũng thấy trong lòng vui tươi . 

đông hải

1 . C . new

2 . A . lives

3 . C . at

4 . C . getting

5 . B . me

6 . B. to

C . 4 . 3 . 2

\(-2--9=-11\)

\(-2+9=7\)

\(3-7-4+8=8\)

\(-23-15+23+5=-20\)

D . \(2H2+O22H20\)

II. Give the correct form of adjective in the bracket.

1- Rivers are (big) bigger  than lakes.                    

2- The Mekong river is (long) longer  than the Red river.  

3- Everest is the (high) higher  mountain in the world.                     

4- Hoa is the (short) shorrter girl in our class.     

5- My mother is as (old) older  as my teacher.

6- The Amazon River is the (deep) deeper  river in the world

7- The Summer is the (hot) hotter  season in a year.                          

8- Nga and Lan are as (short)……shorter……………….. as Minh. 

9- My mother is (young)…younger………………… than my father.                    

10- Ha Noi is (small)……smaller…………….than Ho Chi Minh city.

11- This boy is  as (tall)……taller…………………..as that boy.     

12- A dictionary is (thick)…thicker…………………….. than a notebook.                     

13- The Great Wall is the (long) …longer………….structure in the world                          

14-Buildings are (high)………higher…………….. than houses.        

15- Lan is the (happy)…happier……………………. student in my class.

16- Our parents are the (good)…gooder…………………….. people.

17- This girl is the (thin)……thiner…………………… in her class.      

18- The winter is the (cold)…colder………………. season in a year.  

19- Her daughter is …more beautifu;…………………………. than her (beautiful). 
20- Summer is the …hotter……………………….season of the year (hot)
21-That dog isn’t …………more dangerous……………………….than it looks (dangerous)
22-In the past, people were ……politer……………..………..than today (polite)
23- It is ……colder……………………………..today than it was yesterday (cold)
24- Our hotel was …cheaper………..……..than all the others in the town (cheap)
25-  What’s the ……longer…………….………..river in the world (long)
26-  It was an awful day. It was …bader……….day of my life (bad)
27-  Everest is…higher…………………mountain in the world. It is …………………….….than any other mountain (high)
28 -  I prefer this chair to the other one. It’s …more comfortable………………….…… than the other one. (comfortable)

Question 59 : D

Question 60 : A

Question 61 : C

Question 62 : B

Question 63 ; A

Question 64 : C

Question 65 : D

Question 66 : A

Question 67 : C

Question 68 : A

Question 69 : D

Question 70 : C

Question 71 : A

Question 72 : C

Question 73 : B

Question 74 : C

Question 75 : A

Question 76 : A

Question 77 : D