1. He got down to writing the letter as soon as he returned
=> No sooner had he returned from his walk than he got down to writing the letter.

2. She just had time to put up her umbrella before the rain came down in torrents
=> No sooner had she put up her umbrella than the rain came down in torrents.

3. The only way to eliminate world terrorism is by united opposition.
=> Only by united opposition can the world terrorism be eliminated.

4. The workers only called off the strike after a new pay offer.
=> Not until a new pay was offered did the workers call off the strike.

5. You are the best friend I can find in this world.
=> Nowhere in this world can I find a friend as good as you.

6. There was no precedent for the King's resignation.
=> .Never before had any King resigned.

7. I write to him almost everyday.
=> Hardly does a day go by without my writing to him.

8. Children can learn a lot about how to behave in a situation this.
=> Only in a situation this can children learn a lot about how to behave

9. You will find so many happy people nowhere else.
=> Nowhere else will you find so many happy people.

10. It's seldom wise to disregard the advice that he gives.
=> Seldom is it wise to disregard the advice that he gives

11. They have invited us to their home not once.
=> Not once have they invited us to their home.

nhanh ho cai

c)Ta có: \(x^4+3x^3+4x^2+3x+1=0\)

\(\Leftrightarrow x\left(x^3+2x^2+2x+1\right)+1\left(x^3+2x^2+2x+1\right)=0\)

\(\Leftrightarrow\left(x+1\right)\left(x^3+2x^2+2x+1\right)=0\)

\(\Leftrightarrow\left(x+1\right)^2\left(x^2+x+1\right)=0\)

Ta có: \(x^2+x+1=\left(x+\frac{1}{2}\right)^2+\frac{3}{4}\ge\frac{3}{4}>0\forall x\) nên vô nghiệm

Suy ra x + 1 =0 hay x = -1

X=0 hoặc -1

Thay x = -3 vào pt ta đc:

-27 + 9a + 27 - 9 = 0

=> 9a - 9 =0

=> a =1

Thay a = 1 vào pt

x^3 + x^2 - 9x -9 =0

=> x^2( x + 1 ) - 9( x + 1 ) = 0 

=> ( x+ 1) ( x^2 -9) =0

=>\(\orbr{\begin{cases}x=-1\\x^2-9=0\end{cases}}\)

=> x =-1 hoặc 3 hoặc -3

Phương trình có nghiệm là -3 tức là phương trình có chứa nhân tử x + 3.

Thực hiện phép chia đa thức (đây là phép chia hết) và tìm a như bth=)

H ở đâu ra vậy bạn??

À quên còn đường cao AH nữa >.< sr nhé giải đc giải hộ mk nha

"Chấm" nhẹ hóng cao nhân ạ :)

P/s: mong các bác giải theo cách lớp 8 ạ :) Tặng 5SP / 1 câu nhé ;)

Câu 3: Tham khảo đây nhá: Câu hỏi của Trương Thanh Nhân, t làm r,giờ lười đánh lại.