6. C

7. A

10. C

12. B

14. D

16. D

17. A

18. A

20 A

1. will grown => will grow

2. doesn't it => hasn't it

3. amount => number

4. are destroy => are destroyed

5. Less => Fewer

6. live => lives

7. cause => causes

8. usedn't he => didn't he

\(\frac{1}{a}-\frac{1}{b}=1\Rightarrow\frac{1}{a}=\frac{b+1}{b}\Rightarrow a=\frac{b}{b+1}\\ \)thế vào P ta có:
\(P=\frac{\frac{b}{b+1}-\frac{2b^2}{b+1}-b}{\frac{2b}{b+1}+\frac{3b^2}{b+1}-2b}=\frac{\frac{b-2b^2-b\left(b+1\right)}{b+1}}{\frac{2b+3b^2-2b\left(b+1\right)}{b+1}}=\frac{b-2b^2-b^2-b}{2b+3b^2-2b^2-2b}=\frac{-3b^2}{b^2}=-3\)

5 + 2 = 7

kich nhé

5 + 2 = 7

k mình nhé

1. d

2. d

3. a

4. d

5. b

He seems to be ........ than wethought .

A, quicker

B, more quick

C, quicklier

D, more quicklier

x+300=600+300

x+300=900

       x = 900-300

       x = 600

tk cho mk nhé

99999 + 10008 = 110007