Cho phương trình: x^2 + (3m + 2)x + m2 − 2m – 3 = 0 với m là tham số. a. Chứng minh phương trình luôn có 2 nghiệm phân biệt với mọi m. b. Gọi x1, x2 là 2 nghiệm của phương trình. Tìm m để x1 + 1 = √𝑥2

Giúp mình với

It is difficult for me to finish the task on this weekend.                                   DIFFICULTY

.. I’m sure it wasn’t Jim who did it.                                                                         HAVE

 Viết lại câu cs chứa từ này ạ giúp mik với

21. When you _______ your destination, your tour guide will meet you at the airport.

A. arrive                      B. get                           C. reach                                   D. achieve

22. Choose a correct reply of the following expression: “Do you want this one or that one?”

A- I’ll say it again for you.                               B- I don’t mind. You choose.

C- Never mind. It doesn’t matter.                     D- Yes? Can I help you?

23. I must think that matter over carefully before I answer you.

A. remember                B. decide                     C. consider                  D.memorize

24. Nga is wearing a ____________ T-shirt and green shorts.

  A. beautiful large blue cotton                          B. cotton large blue beautiful

  C. blue cotton beautiful large                          D. beautiful cotton bue large

25. Its three_________are building character , encouraging good citizenship and personal fitness .

A. decisions           B. intentions            C. aims                         D. achievements

26. The girl is standing in the room, ____________ in the mirror.

A to look at herself                             B looking into herself    

C looking after                                    D looking at herself

27. Lucy was late for school this morning because the alarm didn’t _______ as usual.

A. ring off                    B. get off                        C. go off                     D. take off 

28. Last year, there was a big typhoon in my area. It caused extensive damage to our ________.

A. property                B. furniture                   C. wealth                     D. Savings

29. Have you made up your ____________  to buy a new house yet?

A  soul                         B heart                        C mind                        D head

30. Jane: “Would you rather go to the beach or to the mountains?”      Kim: “_______________”

A. That’s very nice of you                             C. I’d love to go

B. Thanks for the mountains                          D. The beach definitely

36.It is the first time I (meet)_ _________him here.

37.Cattle (allow)__ ___________ to graze near the church.

38.Do you smell something (burn) ___________ in the kitchen?

39.The population (increase) _ _____ rapidly in Vietnam nowadays.

40. This is the first time I have read a novel (write) ____ by an American novelist.

41. I (know) __knew__________ the answer, I  would tell  you right away.

42. He has bought two tickets for the concert tonight. He (invite)__ her to the theater.

43. The two girls (play) ____________ chess over there are my classmates

44.  I see the weather doesn’t look very______________.                            (PROMISE)

45. Many people in this area have cholera because they drink ____ water.   (TREAT )

46. The yellow colour of five-colored sticky rice ______ Earth.                     (SYMBOL)

47.  Do you know that villa is____________ situated on the banks ?           (PICTURE )

48.  Some of these______________have lived here all their lives                (VILLAGE)

49. The knife is very blunt. It needs________________                               (SHARP)

50. He didn’t feel happy because he worked ___________                           (SUCCESS).

Mình đang cần gấp ạ!!!!!

Hỗn hợp X gồm: Mg (0,10 mol), Al (0,04 mol) và Fe (0,15 mol). Cho X tác dụng với dung dịch H2SO4 loãng (dư), sau khi các phản ứng xảy ra hoàn toàn thấy có a (mol) H2SO4 đã tham gia phản ứng và khối lượng dung dịch tăng m gam. 

a. Viết phương trình hóa học của các phản ứng xảy ra.

b. Tính a và m

1 :The men and animals ________ were coming through the streets made a big cloud of dust.
A. who                         B. which                      C. that                         D. whom

2:My letter ________have come yesterday, but it didn’t.

A. must                       B. should                     C. ought                      D. can

3:Phone me before eight; ________I’ll be too busy to talk to you.

A. unless                     B. whether                  C. otherwise                D. if

4:This wall is said ________ three hundred years ago.

A. to build                  B. to have been built    C. to have built          D. to be built  

5.   Peter:  "Thanks for your help, John."

             John:  "________ "

            A. With all my heart    B. Never remind me   C. It's my pleasure      D. As you wish

6:The weather is very nice. Let’s go for a walk, ______?

A. shall we                  B. will we                   C. do we                      D. have we

7:She often uses her goods as _______ as she can.

A. economic                B. economically          C. economical             D. economicly

8:Let’s wait for her here; I’m sure she will ________

      A. turn off                   B. turn up                    C. turn down               D. turn over

9:Thousands of people ________ near the Fukushima nuclear power plant have been ordered to evacuate.
A. living                      B. are living                 C. who living               D. A and C are correct

10:It costs about fifty dollars to have a tooth ________.

            A. filling                      B. to fill                       C. filled                       D. being filled

11:The roof was damaged and water ________ from the ceiling in wet weather.

 A. spilled                    B. dripped                   C. drained                   D. dropped

12.________little we may like it, old age comes to most of us.                                                              A. In spite of                  B. So                           C. As                           D. However

13. Madrid is ________ bigger than Granada.

A. much                      B. bit                           C. lot                           D. many

14. You are ________ to clean the bathroom.

            A. declared                 B. imagined                 C. supposed                D. spoken

15. This school needs ________. It looks so old.

A. to repaint                B. repainting               C. repainted                D. to be repainting

16. I had nothing to ________, so I decided to keep silent.                                                                     A. say                         B. tell                          C. talk                         D. speak

17.The captain as well as the passengers ________ frightened.

A. be                           B. was                         C. to be                        D. were

18. In order to buy his house, he had to obtain a large ________ from his bank

A. loan                         B. finance                    C. capital                     D. debt

19. Only because she had to support her family ________ to leave school.

A. that Alice decides  B. did Alice decide     C. does Alice decide   D. Alice decided

20.We have just built _____.

A. three public excellent tennis courts           B. three excellent public tennis courts

            C. three tennis courts excellent public            D. three tennis public excellent courts
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