Cho hình bình hành ABCD (AB lớn hơn BC) tia phân giác góc D cắt AB tại E, tia phân giác góc B cắt CD tại F. ( Vẽ hình )

a/ Chứng minh DE // BF 

b/ Tứ giác DEBF là hình gì? Vì sao?

Cho hình bình hành ABCD; gọi I, K theo thứ tự là trung điểm CD, AB. Đường chéo BD cắt AI và CK theo thứ tự ở M,N

C/m: a/ AI // CK 

         b/ DM = MN = NB

Cho hình bình hành ABCD (AB lớn hơn BC) tia phân giác góc D cắt AB tại E, tia phân giác góc B cắt CD tại F. ( Vẽ hình )

a/ Chứng minh DE // BF 

b/ Tứ giác DEBF là hình gì? Vì sao?

Cho góc xOy = 60 độ, điểm A nằm trong góc xOy vẽ điểm B đối xứng với A qua Ox, điểm C đối xứng với A qua Oy.

a/ So sánh OB và OC 

b/ Tính số đo của góc BOC

Cho tứ giác ABCD. E, F, K lần lượt là trung điểm AD, BC, AC.

a/ So sánh EK và CD, KF và AB

b/ C/m: EF lớn hơn hoặc bằng (AB+CD) : 2

Choose the best answer:

1. How long will he ........ stay there?

A. must    B. should    C. have to     D. has to

2. Don't let your child ....... with matches.

A. play    B. playing    C. to play    D. plays

3. Our team played well .......... to win the gold medal.

A. too   B. that    C. so    D. enough

4. Oh, that's nice. Where ........... it?

A. do you buy   B. are you buy    C. did you buy    D. you buy

5. You'll ...... cook dinner yourself.

A. ought to   B. must   C. should   D. have to

6. Did you succeed ......... the problem.

A. to solve   B. on solving    C. in solving   D. solving

7. What was wrong with you? Why ........... go to hospital?

A. had you to   B. did you have to   C. must you   D. did you must

Use the correct form of the word in bracket to fit each space:

1. Don't let children touch ........... appliances in the homes. (electric)

2. Can you live ....... in one place? (permanent)

3. They live a ............. life. (nomad)

4. For most of the year, we are ........... by vast pastures, rivers and mountains. (surround)

5. I love the feeling of ........... in the countryside. (free)

6. She acts less ......... than anyone here. (responsible)

7. I think that is one of the reasons for ............. . (urban)

8. Using computers too much may have ....... effects on both our minds and bodies. (harm)

9. Going on a trip to the countryside is always an ........ experience in my life. (forget)

10. We will have less .......... if we exercise regularly. (anxious)

Giải thích vì sao điền dạng V đó giúp tớ với nhé. Cảm ơn ạ

Put the adjectives or adverbs in brackets in the correct form:

1. Their house is about three times ............ ours. (big) 

2. The city center is ........ crowded than usual. (little)

3. It's a long walk from here to the station - ...... than i thought. (far)

4. That was the .......... meal i've had for a long time. (delicious)

5. It gets ...... and hotter. Let's go swimming. (hot)

6. The ...... we read, the more we know. (much)

7. The test is not so ...... as it was last month. (difficult)

8. The more things are produced, the ......... prices are. (cheap)

9. That church is the ........ building in the town. (old)

10. He's much ......... than his cousin. (experienced)

11. It's too noisy here. Can you go somewhere .......... ? (quiet)

12. The salary of a bus driver is much ......... than a teacher. (high)

13. Of two boys here, Ba is the ...... . (tall)

14. His English is not as ....... as mine. (well)

15. She is becoming more and .......... . (beautiful)

16. Of the two students over there, Nam is the .......... . (intelligent)

Cho tam giác ABC cân tại A:

a/ BD và CE là 2 đường cao. C/m BCDE là hình thang cân

b/ BD và CE là 2 đường phân giác. C/m BCDE là hình thang cân

c/ BD và CE là 2 đường trung tuyến. C/m BCDE là hình thang cân