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16 tháng 5

28. Traffic law must be obeyed by people.

29. Why should homeless people be given more help by the government?

30. No river in the world is longer than the Nile.

31. I went to see a boy whose bike was stolen outside my shop.

32. If my mother has a passport, she can go abroad.

33. If you don't mind me asking, why not purchase the house?

34. If the house is cheap, he can buy it.

35. Mr Nam said he had gone abroad for a holiday the year before.

36. He said he had finished his project the day before.

37. Tea can't be made with water by people

38. Messi is the most skillful in the club.

39.The boy whose his parents are my father's friend is naughty.

40. I like the students whose behaviour is good.

41. The building which is the tallest in the city near my house.

42. Mr Nam said he had done his homework the night before .

17 tháng 5

28 Traffic law must be obeyed

29 Why should more help be given to the homeless by government?

30 No river in the world is as long as the Nile

31 I went to see the boy whose bike was stolen outside my shop

32 If my mother had a passport, she could go abroad

33 If I were you, I would buy the house

34 If the house weren't expensive, he could buy it

35 Mr Nam said that he had gone abroad for a holiday the year before

18 tháng 3 2022

ảnh lỗi

Câu 3: 

a: \(BD=\sqrt{BC^2-DC^2}=4\left(cm\right)\)

b: \(\widehat{A}=180^0-2\cdot70^0=40^0< \widehat{B}\)

nên BC<AC=AB

c: Xét ΔEBC vuông tại E và ΔDCB vuông tại D có

BC chung

\(\widehat{EBC}=\widehat{DCB}\)

Do đó:ΔEBC=ΔDCB

d: Xét ΔOBC có \(\widehat{OBC}=\widehat{OCB}\)

nên ΔOBC cân tại O

31 tháng 10 2023

Câu 2

a) Thay y = -2 vào biểu thức đã cho ta được:

2.(-2) + 3 = -1

Vậy giá trị của biểu thức đã cho tại y = -2 là -1

b) Thay x = -5 vào biểu thức đã cho ta được:

2.[(-5)² - 5] = 2.(25 - 5) = 2.20 = 40

Vậy giá trị của biểu thức đã cho tại x = -5 là 40

Bài 4: 

\(x=130^0\)

4 tháng 12 2021

cụ thể hơn đc ko ạ

27 tháng 11 2021

1 were - would you play

2 weren't studying - would have 

3 had taken - wouldn't have got

4 would you go - could

5 will you give - is

6 recycle - won't be

7 had heard - wouldn't have gone

8 would you buy - had

9 don't hurry - will miss

10 had phoned - would have given

11 were - wouldn't eat

12 will go - rains

13 had known - would have sent

14 won't feel - swims

15 hadn't freezed - would have gone

26 tháng 12 2022

\(a,=\dfrac{x^3+2x}{\left(x-1\right)\left(x^2+x+1\right)}+\dfrac{2}{x^2+x+1}-\dfrac{1}{x-1}=\dfrac{x^3+2x+2x-2-\left(x^2+x+1\right)}{\left(x-1\right)\left(x^2+x+1\right)}=\dfrac{x^3+3x-3}{\left(x-1\right)\left(x^2+x+1\right)}=\dfrac{x^3+3}{\left(x^2+x+1\right)}\)

26 tháng 12 2022

cho mik câu trả lời chii tiết nhất với ạ !!

 

14 tháng 10 2021

em chịuem thua

14 tháng 10 2021

cái gì đây?

2 A

3 D

4 A

5 A

6 B

7 A

8 A

9 A

a: \(=\dfrac{x^3+2x+2x-2-x^2-x-1}{\left(x-1\right)\left(x^2+x+1\right)}\)

\(=\dfrac{x^3-x^2+3x-3}{\left(x-1\right)\left(x^2+x+1\right)}=\dfrac{x^2+3}{x^2+x+1}\)

b: \(=\dfrac{x^2-2x-3+x^2+2x-3+2x-2x^2}{\left(x-3\right)\left(x+3\right)}\)

\(=\dfrac{2x-6}{\left(x-3\right)\left(x+3\right)}=\dfrac{2}{x+3}\)

c: \(=\dfrac{6-7+x}{3\left(x-1\right)}=\dfrac{x-1}{3\left(x-1\right)}=\dfrac{1}{3}\)

d: \(=\dfrac{x^3+2x+2x-2-x^2-x-1}{\left(x-1\right)\left(x^2+x+1\right)}=\dfrac{x^3-x^2+3x-3}{\left(x-1\right)\left(x^2+x+1\right)}=\dfrac{x^2+3}{x^2+x+1}\)

17 tháng 9 2021

1 is explained

2 was stolen

3 will be opened

4 is being closed

5 is going to be built

17 tháng 9 2021

Cảm ơn bạn ạ

16 tháng 3 2022

1C

2A

3C

4B

5C

6D

7B

8A

9D

10C