Complete the second sentence so that it has a similar meaning to the first sentence, using the word in brackets.

Mrs. Smith is the wisest member of the family. (so) 

Tình

A= \(\dfrac{\sqrt{9+\sqrt{5}}+\sqrt{9-\sqrt{5}}}{\sqrt{9+ 2\sqrt{19}}}-\sqrt{3-2\sqrt{2}}\)

Cho hàm số y=  \(\dfrac{2x}{x^2+1}\). CMR

a) hàm số trên đồng biến trong khoảng(0;1)

b) hàm số trên nghịch biến với mọi x >1

GIẢI THÍCH GIÚP ĐÁP ÁN GIÚP MÌNH VỚI Ạ

Choose the correct answer A, B, C, or D.

1. I suffer from depression and anxiety, but I don’t know                                  to get over my problems.

      A. what                       B. how                        C. where                      D. which

2. Mr. Tan told us that the kids who        in tests often                the others were lucky.  

      A. succeed – thought                                      B. succeed – had thought

      C. didn’t succeed – were thinking                  D. didn’t succeed – thought

3. Miss Hoa said that unsuccessful test takers didn’t know                   the questions came from.

      A. when                      B. where          C. what                       D. why

4.     I want to talk to my teacher about my problems, but I have no idea                    to start, or                    to talk to him.

      A. what – where          B. where – who           C. why – whom           D. where – how

5. As children move toward                               , they are less likely to ask for advice.

            A. dependent  B. dependence C. independent           D. independence

6. Jeff wanted to know                . 

      A. that why were his friends laughing            B. why were his friends laughing

      C. why his friends were laughing                   D. the reason why his friends laughing

III.       Fill each blank with a suitable word to complete the following passage GIẢI THÍCH CÁCH LÀM VỚI Ạ

You can do a few things to make homework less (1)                         . First, be sure you understand the assignment. Write it (2)                      in your notebook or day planner if you need to, and don’t be afraid to ask questions about what is expected. It is much easier to take a minute to ask the teacher during or after class than to (3)                            to remember later that night! If you want, you can also ask how long the particular homework assignment should take to

complete so you can plan your time.

      Second, use any extra time you have at school to work on your homework. Many schools have libraries that are (4)               designed to allow students to study or get homework done. The more work you can get done in school, the (5)                          you will have to do at that night.

      Third, pace yourself. If you don't finish your homework (6)                                school, think about how much you have left and what else is going on that day, and then plan your time. Most (7)                           students have between 1 and 3 hours of homework a night. If it is a heavy homework day, you will need to devote more time to homework.

      No one is (8)                      to understand everything, and maybe you need some help. The first place to turn for help is your teacher. But what if you don't feel comfortable with your teacher? If you are in a big enough school, there may be other teachers who teach the same subject. Speak to other teachers directly and you may be in luck. Sometimes it just helps to have someone (9)                                something in a different way. (10)                         , you might also be able to get some help from another student. If there is someone you like who is a good
student, think about asking that person if you can study together.

1.   A. stressful                  B. purpose                   C. advantage               D. control

2.   A. up                           B. into                         C. off                          D. down

3.   A. fight                       B. discuss                    C. struggle                   D. add

4.   A. specify                    B. specifically             C. special                     D. specifies

5.   A. more                       B. less                          C. little                        D. better

6.   A. during                     B. since                       C. in                            D. on

7.   A. between                  B. high-school             C. among                     D. over

8.   A. stopped                  B. leaved                     C. expected                 D. marked

9.   A. do                           B. make                       C. ask                          D. explain

The word in brackets at the end of each of the following sentences can be used to form a word that fits suitably in the blank.GIẢI THÍCH ĐÁP ÁN GIÚP MÌNH NHÉ

1. We had the phone__________ because we are moving tomorrow. (CONNECT)

2. When did the toys come into ___________? (EXIT)

3. He will be able to receive an ___________ from a government agency. (ALLOW)

4. Are there any ____________ rivers left in the world? (POLLUTE)

5. The newly-built cinema shows a________ of films. (VARY)

6. Do parents get _____________ from their children studies? (SATISFY)

7. He is very _____________ in everything he does. (SYSTEM)

8. Fruit ____________ as it ripens. (SWEET)

9. My brother lives in a ____________ area. (RESIDE)

10. She is extremely ___________ about art. (KNOWLEDGE)

Chia hỗn hợp A gồm sắt (II) oxit và đồng(II) oxit thành hai phần bằng nhau. Phần 1 phản ứng vừa đủ với 200 ml dung dịch H₂SO₄ 2M. Cho phần 2 vào ống sứ, đốt nóng và dẫn một dòng khí CO đi qua ống. Sau phản ứng thấy trong ống còn lại 28 gam hỗn hợp K gồm 4 chất rắn và 10,2 gam khí đi ra khỏi ống. Cứ 1 lít khí này nặng gấp 1,275 lần 1 lít khí oxi đo ở cùng điều kiện.

a/ Xác định % khối lượng mỗi chất trong A.

b/ Cho toàn bộ 28 gam hỗn hợp K ở trên vào cốc chứa lượng dư HCl khuấy đều cho các phản ứng xảy ra hoàn toàn. Tính thể tích H₂ tối đa có thể thu được

Hoà tan 10 gam CuO trong dung dịch H₂SO₄ 24,5% vừa đủ, làm lạnh dung dịch này xuống nhiệt độ thấp tách ra 15,625 g tinh thể T, phần dung dịch bão hoà lúc đó có nồng độ 22,54%. Xác định công thức của tinh thể T.

Hòa tan 4,8 g 1 oxit kim loại bằng dd H2SO4 10% vừa đủ, thu đc dd Muối có nồng độ 12,9%. Sau phản ứng, hạ  nhiệt độ dd ấy có 13,488g muối P kết tinh với hiệu suất 80%. Xác định CT muối P