rút gọn các biểu thức sau : A= (2/ √7 -5)-(2/ √7 +5) ( chỉ √ mỗi số 7 thôi nha) B= ( ( √7+ √5)/ √7 - √5)+(( √7- √5)/ √7 + √5))

II. Give the right forms of the verbs in brackets: Simple past or Past perfect. 1. They (go)………………. home after they (finish) …………………their work. 2. She said that she (already, see) ……………………….Dr. Rice. 3. When we came to the stadium, the match (already, begin)…………………. 4. They told me they (not, eat) …………………such kind of food before. 5. He (ask)……………….. why we (come) ……………….so early. 6. After they had gone, I (sit)…………………. down and (rest)…………………. 7. Before she (watch) …………………..TV, she (do) ……………..her homework. 8. After taking a bath, he (go) ………………to bed. 9. What (be)……………………. he when he (be) ……………….young? 10. It was the first time I (ever, see) ………………….such a beautiful girl.

Bài 1 Khi đánh số trang của một quyển sách có 160 trang, cần dùng bao nhiêu chữ số. Bài 2 Khi đánh số trang của một quyển sách, người ta cần viết 642 chữ số. Hỏi cuốn sách đó có bao nhiêu trang.

5) x2 – x = 0 6) x2 – 2x = 0

Bài 3 : Bạn Hạnh xếp các hình lập phương nhỏ có cạnh 1 cm thành hình bên. Hỏi : A) Hình bên có bao nhiêu hình lập phương nhỏ ? B) Nếu sơn các mặt ngoài của hình bên thì diện tích cần sơn bằng bao nhiêu xăng ti mét vuông ?

Một bếp ăn chuẩn bị số gạo cho 36 người ăn trong 50 ngày. Nhưng thực tế có 60 người ăn, hỏi số gạo đã chuẩn bị đủ dùng trong bao nhiêu ngày? (Mức ăn của mỗi người như nhau)

I. Use the correct form of the word given in each sentence. 1. The............................of the model attracts us much. (efficient) 2. It is suggested that he...............................here now. (be) 3. Would you mind not...................................on the radio until I've finished with this phone call? (turn) 4. There is a.......................of 20% in the amount of money available for buying new books. (reduce) 5. He is an...................doctor who just graduated from the medical school last year. (experience). 6. The new method enables us to do our jobs.................... (effect)

Vẽ anime khóc có line, màu tuỳ, ko app, ko ô li ko kẻ ngang, ko vi phạm luật. P/S: Chắc thế rồi :))

I. Supply the correct verb form: Simple past or Past continuos. 1. When I (arrive) .………….……….at this house, he still (sleep)…………………. 2. The light (go) ……………….out while we (have) …………………dinner. 3. Bill (have) ……………..breakfast when I (stop)……………….. at this house this morning. 4. As we (cross)………………….. the street, we (see) ………………….an accident. 5. Tom (see) ………………a serious accident while he (stand)……………… at the bus stop. 6. While my father (read) …………a newspaper, I (learn) …………….my lesson and my sister (do) …………………her homework. 7. The children (play)……………….. football when their mother (come)…………….. back home. 8. The bell (ring) …………………..while Tom (take) …………………….a bath. 9. I (be) …………………very tired because I (work)……………………. all day yesterday. 10. He (sit) ……………………in a cafe when I (see)………………. him.

42. You shouldn't go out with your friends today and should relax at home because you can make your flu______. It will be bad for their health. A. drop B. spread C. limit D. depress 43______ does Minh feel nervous? – Because he’s seeing the dentist. A. How B. Why C. What D. When 44. ______! You will have a strong heart. A. Eat vegetables more B. Watch TV more C. Eat less fruits D. Wash your face less 45. ______! You will have more time to concentrate on your study. A. Take more pictures when you go out B. Do your exercises more C. Go to sleep early D. Talk on the telephone with your friends less 46. ______! You can lose your weight more quickly. A. Take care of yourself more B. Walk around the park more regularly C. Focus on your own study D. Drink mineral water more when you play in the sun 47. She usually plays badminton, ______she eats a lot of healthy food. A. and B. but C. so D. or 48. You can choose fish and rice for your lunch, ______you can choose fried chicken and some apples for it. A. so B. or C. but D. and 49. He felt pain in his eyes two days ago, ______his mother took him to the doctor. A. but B. because C. or D. so 50. I like eating ice-creams very much, ______I should eat them less to avoid having toothache. A. because B. or C. but D. so