Rewrite the if-clauses using inversion
1. If your order is delayed, please contact customer services.
2. If it had been warmer, we would have stayed longer.
3. If they accept your application, you will have an interview
4. If she hadn’t acted so mean, I would have helped her.
5. If he apologized tomorrow, I wouldn’t accept it.
6. If you chose our premium plan, you would enjoy more benefits.
7. If you need assistance, our guides will be happy to help.
8. If Jim had been available, I would have asked him to do the job.
9. If we had had more time, we would have stayed there all day.

6. I didn't understand his letter because I don't speak Russian. If I (speak) _____ Russian, I would have understood his letter.
7. I'm tired because I went to bed late. If I hadn't gone to bed so late, I _____ tired now.
8. If I were you, I (act) _________ differently. Your behaviour was unacceptable.
9. We are second now. We (be) _______ top of the league if we hadn't lost our last match.
10. If he weren't so lazy, he (finish) _______ the assignment when it was due.

Phân tích các đa tử sau thành nhân tử

a.    15x^2 – 5x^3

b.    8x^3 +4x^2y – y^3 – 2xy^2

c.    x^8 + 64y^4

     I.        Choose the correct options to complete following mixed conditional sentences.

I feel fine because I took the medicine. If I (take) _____ the medicine, I would still be in pain.

I'm not patient and I didn't wait for them. If I was more patient, I (wait) _____ for them.

I didn't know that you were there because I'm not a psychic. I _____ that you were there if I were/was a psychic.

I am where I am today because you helped me. I (be) _____ where I am today if you hadn't helped me.

I’m not your coach now. That's why you lost the trophy. If I (be) _____ your coach, you would have won many more trophies.

I didn't understand his letter because I don't speak Russian. If I (speak) _____ Russian, I would have understood his letter.

I'm tired because I went to bed late. If I hadn't gone to bed so late, I _____ tired now.

If I were you, I (act) _________ differently. Your behaviour was unacceptable.

We are second now. We (be) _______ top of the league if we hadn't lost our last match.

 If he weren't so lazy, he (finish) _______   the assignment when it was due.

a.       Thực hiện phép nhân -\(\dfrac{3}{5}\) x^2y (x+3y^2)

b.       Khai triển hằng đẳng thức: (x-√7y)^2

chứng minh rằng biểu thức sau đây không phụ thuộc vào giá trị của x

(x+2)^3-x^2(x+6)-4(3x+5)-9