11. Before the system of traffic control, there.........be more accidents. A.use to B. is used to C.was used to D.used to 12. My mother ……………… long black hair when she was yound. A. used to have B. would have C. was having D. has 13. Traffic accidents can be prevented if people………… the rules. A. go after B. obey C. take care of D. remember 14. Don’t let young children ……………..alone near a busy road. A. walking B. to walking C. to walk D.walk 15. The film was so boring. ……………, we saw it from beginning to end. A. Therefore B. However C. Although D.Despite 16. Hurry up, or we’ll ………………………………….the last bus. A. avoid B. lose C.miss D.drop 17. Public …………….in this city is quite good, and it’s not expensive. A.travel B.journey C.vehicle D.transport 18.I like the film very much!The characters are unforgetable and the ………is gripping. A. plot B. acting C.style D.action 19. I’m sure you’ll find the film………………… A. amuse B.amused C.amusing D.to amusing 20. I was......... to learn that the director of that gripping film has been given a prize. A. was interested B.interested C.interesting D. was interesting 21.I …………… tennis a lot, but I don’t play very often now. A. Used to play B. was playing C. am used to play D. play 22.My grandma …………… us when my parents were away from home. A. Looked for B. looked after C. looked at D. looked up 23.I lived on a farm once, but I don’t any more A. I use to live on a farm. C. I used to live on a farm. A. I used to living on a farm. D. I was used to live on a farm. 24.Which underlined part is pronounced differently from the others: A. Safety B. electricity C. myself D. anything 25.The letters ………… a few days ago. A. Come B. came C. coming D. comes 26.Where did you ………….. before you move here? A. Use to live B. lived C. live D. used to live 27.John ………… his friends to his house on his birthday yesterday. A. Invitation B. invitate C. invitations D. invited 28.You ……….. take the baby to the doctor. A. Should B. ought C. need D. has to 29.Do you feel …………. before examination? A. Nervously B. badly C. terribly D. nervous 30.I ……………. want to be a practicing doctor but now I’m more interesting in research. A. Was used to B. used to C. would D. use to

cho A=(1/2 mũ 2).(1/3 mũ 2-1)(1/4 mũ 2-1)...(1/2017 mũ 2-10).(1/2018 mũ 2-1) và B=âm1/2 hãy so sánh A vàB

Bài 1 Cho hai tập hợp M = { a,b,c } Viết các tập hợp con của tập hợp M sao cho mỗi tập hợp đó có hai phần tử Bài 2 Bạn Thủy đánh số trang sách bằng các số tự nhiên từ 1 đến 100 . Hỏi Bạn Thủy phải viết tất cả bao nhiêu chữ số ?

Cho biểu thức: F = ($\frac{x}{x-1}$ + $\frac{2x+6}{x^2-3x}$ - $\frac{2}{x^2-x}$): $\frac{x^2-x+4}{x^2-4x+3}$ a. Tìm điều kiện xác định của x để F được xác định b. Rút gọn biểu thức F c. Tìm x để F có GTLN

a) x^2+4x+4= b) x^2-8x+16= c) (x+5).(x-5)= d) x^2+2x+1= e) x^2-1= f) x^2+6x+9= g) 4x^2-9= h) 16x^2-8x+1= i) 9x^2+6x+1= k) 36x^2+36x+9=

Phân tích đa thức thành nhân tử

Giúp mik vs (phân tích đa thức thành nhân tử)

Cho góc xOy =$\alpha$ , điểm A nằm trên Oy. Qua A vẽ tia Am. Tính số đo góc OAm để Am song song với Ox

giúp mình vs mk cần gấp (vote 5 sao +tlhn)

giúp mình vs mk cần gấp (vote 5 sao +tlhn)