Muối trung hoà và muối axit có đặc điểm như thế nào để thay đổi màu quỳ tím.

Hãy chọn câu trả lời đúng nhất. 1. I didn't have enough money, ........................................... A. that I couldn't buy the computer B. so I couldn't buy the computer C. and I couldn't buy the computer D. but I couldn't buy the computer 2. He didn't read the instruction carefully, ......................................... A. so he couldn't operate the machine B. he couldn't operate the machine C. that he couldn't operate the machine D. and he couldn't operate the machine 3. He enjoys the music so much ...................................... A. that he listens to it every day B. in order to listen to it every day C. for listening to it every day 4. There are so many people ................................ A. we can't find him easily B. that we can't find him easily C. so it is too difficult to find him easily D. that we can find him anywhere easily 5. He couldn't stand the boring film, .................................. A. so he went home earlier B. he goes to bed earlier C. that he decided to go home earlier D. and he decided to go home earlier

1+2+3+4+5+...+100 BẰNG BAO NHIÊU CÁC BẠN TÍNH NHANH

Giúp mình bài này với nha 1) liệt kê tập hợp sau : a) A={ x ∈ Z/ |x-1|<2} b) B={x ∈ R/ x^2-3x+2=0 và x^2-4x+3=0} c) C= {x ∈ R/ x^3-6x^2+8x=0}

Bài 2 : Cho tam giác ABC và hai đường trung tuyến BD , CE cắt nhau tại G . Gọi M , N lần lượt là trung điểm của BG , CG . Chứng minh tứ giác MNDE có các cặp cạnh đối song song và bằng nhau ( có hình càng tốt ) ( Lưu ý : Ko dùng kiến thức về hình bình hành nhé , chỉ dùng về đường trung bình , hình thang , tứ giác , hình thang cân thôi nhớ ) ( Làm sai yêu cầu =báo cáo )

Câu 9.Với các số thực x, y thỏa mãn x -căn x+6 = căn y+6 -y tìm giá trị lớn nhất và giá trị nhỏ nhất của biểu thức P = x + y

$\sqrt{10+2\sqrt{6}+2\sqrt{10}+2\sqrt{15}}$ Rút gọn giùm mình

Giải pt $\sqrt[]{x^{2} -2x}$ = $\sqrt[]{2-3x}$

280g dd NaOH 11,43% + 448 gam dd H2SO4 Đem hạ t0 -> 7 độ C thu được dd A chứa muối bão hòa nồng độ 7,1% a. Tính m muối kết tinh ngậm 10 phân tử nước b. Tính độ tan của A

PART II- Choose the best answers to completes each sentence. 1. What _______ in the living room at this time last Monday? A. happened B. had happened C. has happened D. was happening 2. Let’s play soccer if you _________________ your homework. A. have finished B. are finishing C. finish D. finished 3. Thanks __________ the weather forecast, we can arrange what we want to do. A. to B. for C. with D. about 4. They are _______________ to play volleyball well. A. enough height B. enough high C. too tall D. tall enough 5. Each teacher and each student _______ to try their best to finish their work. A. have B. having C. to have D. has 6. Yesterday morning I got up late because my alarm clock didn’t ____________. A. go on B. go off C. go out D. go through 7. The man _________ by his girl friend will go on business with my father. A. was accompanied B. were accompanied C. accompanied D. accompanying 8. You are requested ____________ part in the outside activities. A. not taking B. to not take C. not to take D. not to be taken 9. The newspaper contains a lot of __________ about that fifth storm. A. news B. information C. fact D. article 10. Her mother has just bought a ________________ car for her. A. Italian beautiful black B. beautiful black Italian C. black Italian beautiful D. black beautiful Italian 11. I regret ___________ you that you will not be chosen the best competitor. A. to tell B. telling C. told D. tell 12. She is said _________________ Viet Nam two years ago. A. to leave B. leaving C. to have left D. having left 13. I like that photo very much. Could you make an _______ for me? A. increase B. enlargement C. expansion D. extension 14. No one has to leave here for the country, _____________? A. has he B. have they C. does he D. do they 15. Which boy is _______________, Nam or Minh? A. the most intelligent B. more intelligent C. as intelligent D. intelligent 16. There ___________ changes of the climate for the last ten years. A. are B. has been C. have been D. were 17. Turn down the television. Your brother ________ his homework in the next room. A. is doing B. does C. was doing D. has done 18. Do you mind me ____________ your car to the country tomorrow? A. drove B. drive C. to drive D. driving 19. ____________ the weather was awful, they had to call off the football match. A. Though B. Because C. Due D. However 20. This is my sister’s motorbike and that is my______________. A. brother B. motorbike’s brother C. brother motorbike D. brother’s