Chọn A

\(\dfrac{2x^3-24x-20}{x^2+4x+3}\)

\(=\dfrac{2x^3+8x^2+6x-8x^2-32x-24x+2x-20}{x^2+4x+3}\)

\(=2x^2-8x+\dfrac{2x-20}{x^2+4x+3}\)

Bạn nên tách ra thành đừng đoạn nhỏ thì sẽ có thể có người trả lời nhanh hơn đó ạ (no toxic)

#Jannie

16.  I am tired, ……… I will go to bed early.

A. but B. and C. so D. because

17. ……… do you like the Animals program? ~ Because I love animals.

A. When B. Why C. Where D. What

18. William Shakespeare is ……… British writer in the world.

A. more popular             B. the more popular

C. most popular D. the most popular

19. You can take these plastic bottles to the factory to ……… them.

A. recycle B. reuse C. reduce D. use

20. ……… I don’t like vegetables, I eat them everyday.

      A. But      B. If C. Although D. Because

21. If I ……… a bird, she……… be a white dove.

A. am/ will be B was/ would be

C. were/ would be D was/ will be

22. ……… is special clothing to wear when astronauts work outside in space.

A. Space station  B. Gravity   C. Spaceship  D. Spacesuit

23. In the future, automatic food machines ……… all our food.

A. might make B. will be C. have D. prepares

24. A ……… will help you see in the dark.

A. battery B. flashlight               C. horror         D. drama

25. - A: Should we bring some snacks to eat? 

- B: ………

A. Yes, I did.         B. Yes, good idea.  

 C. Yes, you need. D. I don’t have.

26. " I 've just received a scholarship". -  ".......................!"

    A. Really                             B. Thank you                C. Congratulations       D. Well

27. "....................................? " - She is very kind and creative.

     A. What does your best friend look like?           B What is your best friend like?

      C. How is your best friend?                                 D. What does your best friend like?

28. There is a big temple in the town. ...........temple is very old.

       A.  A                                 B. The                      C. An                        D. X (no article)

29. We should use reusable water bottles.....................of plastic ones.

      A. because                         B. instead                 C. despite                   D. however

30. Children will work hard if the lessons are.....................

A. interesting               B. interested            C. interest      D.boring

16.A

17.B

18.D

19.A

20.C

21.A

22.D

23.A

24.B

25.B

26.C

27.B

28.B

29.B

30.A

16.  I am tired, ……… I will go to bed early.

A. but B. and C. so D. because

17. ……… do you like the Animals program? ~ Because I love animals.

A. When B. Why C. Where D. What

18. William Shakespeare is ……… British writer in the world.

A. more popular             B. the more popular

C. most popular D. the most popular

19. You can take these plastic bottles to the factory to ……… them.

A. recycle B. reuse C. reduce D. use

20. ……… I don’t like vegetables, I eat them everyday.

      A. But      B. If C. Although D. Because

21. If I ……… a bird, she……… be a white dove.

A. am/ will be B was/ would be

C. were/ would be D was/ will be

22. ……… is special clothing to wear when astronauts work outside in space.

A. Space station  B. Gravity   C. Spaceship  D. Spacesuit

23. In the future, automatic food machines ……… all our food.

A. might make B. will be C. have D. prepares

24. A ……… will help you see in the dark.

A. battery B. flashlight               C. horror         D. drama

25. - A: Should we bring some snacks to eat? 

- B: ………

A. Yes, I did.         B. Yes, good idea.  

 C. Yes, you need. D. I don’t have.

26. " I 've just received a scholarship". -  ".......................!"

    A. Really                             B. Thank you                C. Congratulations       D. Well

27. "....................................? " - She is very kind and creative.

     A. What does your best friend look like?           B What is your best friend like?

      C. How is your best friend?                                 D. What does your best friend like?

28. There is a big temple in the town. ...........temple is very old.

       A.  A                                 B. The                      C. An                        D. X (no article)

29. We should use reusable water bottles.....................of plastic ones.

      A. because                         B. instead                 C. despite                   D. however

30. Children will work hard if the lessons are.....................

A. interesting               B. interested            C. interest      D.boring

a: Nửa chu vi mảnh vườn là 90:2=45(m)

Chiều rộng mảnh vườn là 45-x(m)

Diện tích mảnh vườn là \(x\left(45-x\right)=45x-x^2\left(m^2\right)\)

b: Khi x=30 thì diện tích mảnh vườn là:

\(45\cdot30-30^2=1350-900=450\left(m^2\right)\)

a) Nửa chu vi mảnh vườn là 90:2=45(m)

Chiều rộng mảnh vườn là 45-x(m)

Diện tích mảnh vườn là:

x (45 - x) = 45x - x² (m²)

b) Khi x = 30 thì diện tích mảnh vườn là:

46 • 30 - 30² = 1350 - 900 = 450 (m²)

Vậy ...

Hô hấp tế bào là quá trình tạo ra năng năng lượng từ các hợp chất hữu cơ.

cho tick để tui lên 100 đê

@ Hải Đăng

Bn cop mạng mà ko ghi tham khảo sẽ bị báo cáo CTV đó bn!

a: Xét ΔCAE vuông tại A và ΔCDE vuông tại D có

CE chung

\(\widehat{ACE}=\widehat{DCE}\)

Do đó: ΔCAE=ΔCDE

=>\(\widehat{AEC}=\widehat{DEC}\)

=>EC là phân giác của góc AED

b: Ta có: ΔCAE=ΔCDE

=>CA=CD và EA=ED

Ta có: CA=CD
=>C nằm trên đường trung trực của AD(1)

Ta có: EA=ED

=>E nằm trên đường trung trực của AD(2)

Từ (1),(2) suy ra CE là đường trung trực của AD

c: Ta có: \(\widehat{CIH}+\widehat{ICH}=90^0\)(ΔCHI vuông tại H)

\(\widehat{CEA}+\widehat{ACE}=90^0\)(ΔCAE vuông tại A)

mà \(\widehat{ICH}=\widehat{ACE}\)

nên \(\widehat{CIH}=\widehat{CEA}\)

=>\(\widehat{AEI}=\widehat{AIE}\)

=>ΔAIE cân tại A