Giải pt

\(x^4-5x^3-8x^2\) \(-5x+1\)

Giải pt

\(2\left(x^2+\frac{1}{x^2}\right)\)- \(3\left(x+\frac{1}{x}\right)\)+ 2 = 0

A= \((\)\(\frac{3}{2x+4}\) + \(\frac{x}{2-x}\) - \(\frac{2x^2+3}{x^2-4}\) \()\) : \(\frac{2x-1}{4x-8}\)

Rút gọn A

Cho P =\(\frac{a-2}{a+2}\) - \(\frac{a+2}{a-2}\) + \(\frac{4a^2}{4-a^2}\) và Q = \(\frac{2a-a^2}{a+3}\)

a. Rút gọn P

b. Tìm a để P=1

c. Tìm a để P.Q < 0

Supply the correct tense

1/ He said he (be) __________ sorry he (give) __________ me so muchtrouble.

2/ I am sorry that I (not know) _________ you (leave) __________ your pipe when you (come) __________ to see me last Thursday.

3/ He (be) __________ so good to me when I was a boy that to this day I (not forget) __________ his kindness, and I hope that I (never forget) __________.

4/ He (sleep) __________ and (not understand) ___________ what you (say) __________ to him. He (wake) __________ if you (speak) __________ louder.

5/ Some animals (not eat) ___________ during the winter and only (come) __________ out in spring.

6/ After leaving school he (study) __________ French in Paris for two years and then (move) __________ to America, where he now (live) _________. He (visit) __________ England once or twice and (know) __________ English well; but (not have) __________ yet the opportunity of visiting European countries.

7/ I (know) __________ him for a very long time.

8/ When my friend Tom grows a beard, even his closest friends (not recognize)__________ him.

9/ When I (meet) __________ him in the street, he (go) __________ to the pictures.