khỏang cách từ A đến B dài 20km.Tại B ,một xe đạp xuất phát vs vận tốc 10km|h theo chiều AB. Tại B một xe đạp khác xuất phát vs vận tốc 20km/h đuổi theo xe một. Sau bao lâu thì đuổi kịp, khi đó xe hai đã đi đc bao nhiêu km?

Tíh

a,\(\frac{2-a}{2a}\)+\(\frac{1}{2}\)

b, \(\frac{6x-x+a}{6a-a}\)+\(\frac{1}{1-6}\)

c, \(\frac{1-x}{2.\left(x+1\right)}\)+1\2

d, \(\frac{3}{b-1}\)+\(\frac{7-b^2}{2b-2}\)

e, \(\frac{3x}{5}\)+\(\frac{-9x+13x}{15a-5}\)

các bn giúp mk vs , tí nộp bài r

DỰA vào từ cho sẵn, vt câu hỏi hoàn chỉnh.

1.how many/ groups of people / there / in your country?

2. How / your / party / last week?

3. How / you / go / school / yesterday?

4. Whose /eat/it?

5. Jim /learn /Geography /at the moment?

6. You/ever/see/terraced fields?

Choose the best answer

1. Are you... with the result?

A. Satisfy C. Satisfying

B. Satisfied D. Be satisfying

2. My brother sings... than me.

A. Better B. Weller C. Gooder D. Well

3. The... result of work are... we are very sad.

A. Disappointed

B. Satisfying

C. Disappointing

D. Satisfied

4. She is ... young but she performs .....

A. Excellent

B. Excelly

C. Excellently

D. Excellence

5. I decided to quit this job... the low.

A. Because of

B. Despite

C. Because

D. Although

6. I went to colled my car but it was not ready. When i went to the service station... still...

A. Was/ serving

B. Was/ serviced

C. Had been/ serviced

D. Was/being serviced

7... the film was gripping . Tom slept from be ginning to end.

A. However

B. Although

C. In spite of

D. Despite

8. We are going to London next month. This will be the first time i... there.

A. Have been

B. Shall be

C. Is having

D. Had

Choose the best answer

1. ..... tell me all .... your trip to Washington.

A. In B. With C . On D. About

2. The teacher stands ... the class.

A. FROM B. At C. in front of D. By

3There is a map on the wall just... the teacher is desk.

A. From B. Above C. Before D. In fron of

4. February comes... March.

A. Behind B. After C. Before D. During

5. July comes..Jun

A. Before B. After C.Behind D. In

6."Tall" is the opposite...."short"

A. To B. Of C.Against D. With

Complete these sentences with the correct prepositions

1. ....... 2005 . I live in Da Lat.

2. We meet him..... May.

3. ...... Tuesday morning. There is a meeting.... 8.00

4. Goodbye ! See you .... Monday

5. It's very cold. .. the winter.

6. They planned to have the trip ..... June.

7. She loves to watch starts .... night

8. ..... the morning, we often go to work. ....6.00

9. She arrives. ..... four o'clock ..... the afternoon.

10. Liz met Lan's family... her house. .. the morning.

11. I was born. .. September 15th.

12. The bus collected us...... 5 o'clock early. ... the morning.

Choose the best answer

1. It.... Lan 20 minutes to go to school by bike