Đây là tiếng anh mà bạn sao lại cho toán vào z

5 . Complete this dialogue .[ hoàn chỉnh bài hội thoại này]

Is your school big

no. It isn't

How many floors does it have

It has two floors .

which class are you in

I am in class 6A

where is your classroom

It's on the first floor.

1. My school is bigger than my sister's school.

2. Life in the city is more exciting than life in the country.

3. Lan's family will visit Ha Long Bay in this summer.

4. My grandfather is the oldest person in my family.

5. Tuan want to go to Hoi An Old Town with his friends in this summer.

a) 4x²-25-(2x-5)(2x+7)=0

<=> (4x²-25)-(2x-5)(2x+7)=0

<=> [(2x)²-5²]-(2x-5)(2x+7)=0

<=> (2x-5).(2x+5)-(2x-5)(2x+7)=0

<=> (2x-5).[(2x+5)-(2x+7)]=0

<=> (2x-5).(2x+5-2x-7)=0

<=> (2x-5).(-2)=0

=> 2x-5=0

<=> 2x=5

<=> x=5/2

Vậy x=5/2

b) 2x³+3x²+2x+3=0

<=> (2x³+2x)+(3x²+3)=0

<=> 2x(x²+1)+3(x²+1)=0

<=> (x²+1).(2x+3)=0

x²+1=0 x²= -1(vô lí)

<=> <=>

2x+3=0 x= -3/2

Vậy x= -3/2

1.

I think it is necessary for secondary school students to wear uniforms at school because of some reasons. Firstly, wearing uniforms helps students feel equal in many way, whether they are rich or pool. Secondly, wearing uniforms encourages students to be proud of their school. Finally, wearing uniforms is practical. The students don't have to think of what to wear every day. Therefore, secondary school students should wear uniforms.

2.

Although there are many festivals throught a year, I like the mid- fall festival best because of the following reasons. Firstly, it happens in August. We can enjoy the special cake named Trung Thu cake with some delicious fruit and sweet. Secondly, we can wear marks and crowd to join the colorful parade on the streets. Finally, we can sind some songs about this festival such as " Ruoc den ong sao", " Dem sao",... and play some games with our friends. Therefore, The Mil- fall festival is my favorite festival.

1. went

2. have already used

3. have clearned

4. was teaching

5. went

6. has clearned

7. read

8. is reporting

9. has already done

10. go

11. hasn't met

12. Has she worked

13. read/ discuss

14. have known/ has worked

15. have just finished

16. were driving/ saw

17. were watching/ was phoning

18. has lived/ left

19. started

20. was sleeping/ was ringing

21. didn't understand

22. saw/ was making

23. did you get

24. live/ is living/ has lived

25. watched

26. has lived

27. played

28. was falling/ was reading

29. buys

30. hasn't done

31. was reading

32. watching

a) 47,5.6,3-17,5.3,3-17,5.6,7+3,7.47,5

= (47,5.6,3+3,7.47.5)-(17,5.3,3+17,5.6,7)

= 47,5.(6,3+3,7)-17,5.(3,3+6,7)

= 47,5.10-17,5.10

= 475-175

= 300

b) 43²+40²-17²+80.43

= (43²+80.43+40²)-17²

= (43+40)²-17²

= (43+40-17).(43+40+17)

= 66.100

=6600

là sao z bn

/s/: clocks, caps, sinks

/z/: villas, photos, houses, brothers, windows, cupboards

/iz/: fridges, lunches, watches

a) Ta có: x³+ 3x²+ 3x+ 1

= (x+1)³

Thay x =999 vào biểu thức ta đc:

(999+1)³= 1000³= 1000000000

b) Ta có: x³- 3x²+ 3x- 1

= (x-1)³

Thay x=101 vào biểu thức ta đc:

(101-1)³=100³=1000000