Chủ đề:
Phân thức đại sốCâu hỏi:
g) x+3/x+1 +2x-1/x-1 +x+5/X2-1 ;
Bài1: Thực hiện phép tính
a) 2x(3x2 – 5x + 3) b) - 2x ( x2 + 5x+3)
Bài 4: Tìm x, biết.
a/ 3x + 2(5 – x) = 0 b/ x(2x – 1)(x + 5) – (2x2 + 1)(x + 4,5) = 3,5
c/ 3x2 – 3x(x – 2) = 36.
II. PHÂN TÍCH ĐA THỨC THÀNH NHÂN TỬ
Bài1: Phân tích đa thức thành nhân tử.
a/ 14x2y – 21xy2 + 28x2y2 b/ x(x + y) – 5x – 5y.
c/ 10x(x – y) – 8(y – x). d/ (3x + 1)2 – (x + 1)2
e/ 5x2 – 10xy + 5y2 – 20z2. f/ x2 + 7x – 8
g/ x3 – x + 3x2y + 3xy2 + y3 – y h/ x2 + 4x + 3.
Tìm x, biết.
a/ 3x + 2(5 – x) = 0 b/ x(2x – 1)(x + 5) – (2x2 + 1)(x + 4,5) = 3,5
c/ 3x2 – 3x(x – 2) = 36.
d/ (3x2 – x + 1)(x – 1) + x2(4 – 3x) =
Bài 1: Tính chia:
a) (6x5y2 - 9x4y3 + 15x3y4): 3x3y2 b) (2x3 - 21x2 + 67x - 60): (x - 5)
c) (6x3 – 7x2 – x + 2) : (2x + 1) d) (x2 – y2 + 6x + 9) : (x + y + 3)
1/hợp chất A có thành phần các nguyên tố sau 52,94% Al và O . xác định công thức hóa học của A biết khối lượng mol của A 120g/mol
2/hợp chất C có thành phần các nguyên tố sau 2705% Na và16,47%N và O . xác định công thức hóa học của C biết khối lượng mol của C 85g/mol
1. There’s a tradition of having parties _________ Christmas.
A. on B.in C. at D. for
2. Generally, rice is served _________ fish, meat, soup and vegetable.
A. to B.as C. in D. with
3. You have to _________ your hat when going inside the main worship area of the temple.
A. take off B.puton C. break with D.getout
4. You _________ place your chopsticks on your rice bowl when finished with a meal. Don’t rest them on the table.
A. shouldn’t B. don’t have to C. should D. mustn’t
5.You look really tired. You _________ take a few days off and have a holiday.
A. should B. must C. have to D. can
6. Sorry, but my train is at 6.00. I _________ leave now.
A. shouldn’t B.ought to C.mustn’t D. have to
7. John can’t come because he _________ work tomorrow.
A. should B.can C.must D. has to
8. I know they enjoy their work, but they ______ work at the weekends.It’s not goodfor them.
A. shouldn’t B.don’t have to C. mustn’t D. have to
9. Elderly people _________ be treated with great respect
A. shouldn’t B. should C.aren’t obliged to D. mustn’t
10. Last week, we ____________dinner with a French family.
A. have B. has C. have had D. had
11. I hate eating with spoon because it____________trouble when I eat fish.
A. causes B. caused C. is causing D. will cause
12. In the past, ao dai ____________ by both men and women.
A. wears B. was worn C. is worn D. wore
13. The speaker _________a presentation on Vietnamese customs and traditions right now.
A. gives B. is giving C. has given D. gave
14. She ____________ to six countries since she ____________the job.
A. has travelled/ started B. travels / starts
C. travelled/ started D. has travelled/ starts
15. Our family __________ dinner together every Saturday night. It’s our family tradition.
A. had B. have C. is having D. is having
16. I hope I ____________ a chance to visit your country soon.
A. have B. was having C. will have D. has
17. When in Japan, you should avoid ____________ on the go.
A. eat B. to eat C. eating D.eatting
18. I think you should ____________ to the doctor. You look terrible.
A. go B. to go C. going D. goes
19. The Japanese tend ____________ their mobile phones discreetly when in public.
A. using B. to use C. use D. uses
20. I_____________this novel for 2 hours.
A. read B. am reading C.have read D. will read
21. Do you like___________in the sea?
A. swim B. to swim C. swimming D. swiming
22. We___________each other since last week.
A. haven’t phoned B. didn’t phone C. won’t phone D. don’t phone
23. The street often__________very crowded after 5pm everyday.
A. become B. becomes C. became D. has become
24. I really don’t mind _____________ the housework.
A. to do B. do C. doing D. does
25. I had to_____________ out last night .
A. go B. going C. to go D. goes
26. Would you mind _______________ so much noise?
A. making not B. not to make C. not making D. to make not
27. I normally try to avoid ___________ money.
A. borrows B. borrow C. borrowing D. to borrow
28.I don’t know how ………………………soccer.
A. play B. playing` C. to play D. plays
29. According …………tradition, we shouldn’t break things at Tet.
A. at B. to C. by D. with
30.We break with tradition ……………not eating mooncakes on Mid- Autumn Festival.
A. at B. to C. by D. with