Cho phương trình: x 2 - 2( m+ 1)x + m 2 + 2m = 0 (1) ( m là tham số)
a)Giải phương trình với m = 1.
b)Tìm m để phương trình có hai nghiệm \(x_1,x_2\) thỏa mãn \(x_1^3-x_2^3=8\)

Cho biểu thức \(A=\frac{\sqrt{x}}{\sqrt{x}+3}+\frac{2\sqrt{x}}{\sqrt{x-3}}-\frac{3x+9}{x-9}\) (đkxđ: \(x\ge0;x\ne9\)

Rút gọn và tìm giá trị lớn nhất của A

27. A studied B. raised c.played d. worked

29.A traveled B. wrapped C. liked D. faxed

30. A.washed B. advised C. promised D. talked

A. athletics B. participants C. efforts D. skills

PREPOSITION + COMPARISON

3. Write comparative from of the adjectives in parentheses:

1. My brother is (good-looking)....................................than I am.

2. This book is (wonderful)...................................than that comic book.

3. Nina is (nice)........................................than Jinny.

4. She is (happy).........................................than I am.

5. This bike is (cheap)..........................................than mine.

6. This house is much (comfortable)........................................than mine.

7. A dog is (haevy)..........................................than my cat.

8. My pencil is (long).....................................than your.

9. My teacher is (beautiful)............................................than old one.

10. Ho Chi Minh City is (large).......................................than Bien Hoa.

11. The red jacked is (cheap).........................................than the blue jacked.

12. The shoes are (nice)..........................................than the boots.

13. The pink socks are (expensive).............................................than the white socks.

14. The brown sweater is (good)............................................than the blue sweater.

15. The chocolate looks (bad).................................................than the candy.