Bài 3:Cho tam giác ABCcó ba góc nhọn, AB < AC. Qua trung điểm Dcủa cạnh BC kẻđường thẳng vuông góc với tia phân giác của góc BACcắt các đường thẳng ABvà AClần lượt tại Hvà K. a) Chứng minh rằng: HAKcân.b) Chứng minh rằng: BH = CK.c) Tính độdài các đoạn thẳng AHvà BH, biết AB= 9cm, AC= 12cm.
I. Give the correct forms of words in the bracket.
1. What is her …………….………….? She’s 44 kilos. (weigh)
2. Write your ………………………on the medical record. (high)
3. The nurse told me to go to the …………………….room. (wait)
4. Doing exercise regularly can help you keep ………………………….. (health)
5. Lan is having a ……………………check-up. (medicine)
6. Minh has to see the dentist because he has a ……………………(tooth)
7. The dentist is very kind and ………………….. (help)
8. I have a(n) ……………………………with the doctor this afternoon. (appoint)
9. When I go to the library, I sit and read about ……………….things. (wonder)
10. ………………….is one of my hobbies and now I can make clothes for myself. (sew)
11. I love watching …………………….little fish in the aquarium. (color)
12. Do you like sewing? Yes, it’s a …………….……hobby. I can wear what I can make. (use)
13. These medicines can work well with your ……………………….(ill).
14. Don’t worry. Your cold will last for a few days and then ……………………….(appear)
15. Peter likes to travel to Vietnam because the sights are …………………and people are …………………… (beauty – friend).
II. Put the verbs in brackets into the correct tense or form.
1. Last night we (go)………………………….to Lan’s birthday party.
2. We (move)……………………………..to this city ten years ago.
3. My mother (buy) …………………….me a dictionary last week.
4. My parents (visit) …………………………….my grandparents last month.
5. Last year Mr. John (teach)……………………………us English.
6. She (stay) ……………………………in Hue for ten days last year.
7. Last week we (not go)…………………….to school on Saturday.
8. She (not work) ……………………….at the moment. She (listen)………………..to music.
9. Nam often (play) …………………………..basketball in his free time. He (not like)……………………….sports.
10. Tomorrow (be)………………....her birthday. She (invite)…………………..………….some friends to her house.
11. Nam’s mother (help)…………………………him iron the clothes last night.
12. We (speak) …………………………to the principal yesterday afternoon.
13. My sister (write)………………………..a letter to our aunt in Nha Trang yesterday.
14. I often get up early to (take)…………………………morning exercises every morning.
15. Mr. Lam (not do)………………………..morning exercises when he (be) …………………young. Now he (do)………………………..exercise every morning.
16. Now Hoa (talk)……………………..to Ba about her recent vacation in Nha Trang.
17. Last week, the Robinsons (move)……………………..to a new apartment.
18. Liz (come) ………………….to visit me next week.
19. Last week, the dentist (fill) …………………..a cavity in my tooth.
20. The Robinsons (go)…………………to a food stall for lunch last Sunday.
III. Prepositions
1. What is wrong …………………..you?
2. The doctor will see you ………………….a few minutes.
3. You should stay inside …………………..recess.
4. Whatever you do, your cold will last ………………..a few days and then disappear.
5. I bought a lot of different gifts …………………my friends in America.
6. There was a souvenir shop ………………..the exit of the aquarium.
7. The cap has a picture of a dolphin ………………..it.
8. Liz bought a poster and hung it …………………………..the wall at home.
9. Liz helps me …………………………my stamp collection.
10. She bought the material and made the dress …………………..me.
11. A skirt is green with white flowers ……………………….it.
12. She tried ………………..a new dress, but it didn’t fit her.
13. My parents work very hard ……………………….the farm.
14. You shouldn’t eat too much candy or stay …………………..late.
15. I felt a lot better ……………………she fixed my tooth.
16. They are waiting …………………..see the doctor.
17. Jack arrives …………………….Hanoi ………………...train.
18. At the drugstore, there are usually shelves ……………….cold “cures”.
r
Số bàn thắng trong mỗi trận bóng đá ở vòng đấu bảng vòng chung kết một giải bóng đá được ghi lại như sau:
1 2 3 8 2 4 1 4 1 3 2 2
4 2 2 5 2 2 1 2 3 4 1 1
3 4 3 2 1 2 2 4 0 6 2 3
2 0 5 4 7 3 2 1 2 5 1 4
a) Dấu hiệu điều tra ở đây là gì? Có bao nhiêu trận đấu ở vòng đấu bảng?
b) Lập bảng “tần số” và rút ra một vài nhận xét về vòng đấu bảng.
c) Vẽ biểu đồ đoạn thẳng.
d) Tính số bàn thắng trung bình của mỗi trận đấu. Tìm mốt của dấu hiệu.