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a} (x-y) (3x-2y) b} A=(x+y) (x ²+y ²)

Câu 1: Giá trị của biểu thức : 5x ² - [ 4x ² - 3x ( x - 2 ) ] với x = - 1/2 là : A.-3 B.3 C.-4 D.4

Thực hiện phép tính a, $\frac{2}{5}$x $\sqrt[]{25}$ - $\frac{16}{81}$+ $\sqrt[]{144}$ b, 0,5x$\sqrt[]{0,09}$ -2+ $\sqrt[]{1/4}$ c, $\sqrt[]{25/16}$- $\frac{3}{2}$ $\sqrt[]{64/9}$ d, -$\sqrt[]{-289/-16}$+10 x -$\sqrt[]{-0,09/9}$

Tìm hai số biết tổng của chúng là 0,25 và tỉ số giữa hai số đó cũng bằng 0,25.

Tính a) (2x-y+2)^2 b)(xy/2-x/3).(xy/2+x/3) ko lm tắt nha

1,P=(3V18-2V98+V72):V2 2,V147X/V3X (VỚI X>0) 3,V^2y^4/64 (Với X>0) 4,2/x.V49x^2/16( với x>0) 5,2y/x.Vx62/4y^4 (với x>0 ) 6,V4(a-1)^2/25

REPORTED SPEECH 16. She wondered “Why did the price go up so often?” ______________________________________________________ 17. The girl asked “Can you play the guitar" ______________________________________________________ 18. She asked me "How did you hear about the course?" _________________________________________________________ 19. “If you want to learn English, I can help you" John said. ____________________________________________________________ 20. He said to me "I have something to show you now" _________________________________________________________ 21. “Where are you studying? ” Mr Nam asked ______________________________________________ 22. She said “I'm leaving here for Hue tomorrow" _________________________________________________ 23. “Please call me at 6 o'clock tomorrow morning" said Mai. _______________________________________________________________ 24. “I will come with you as soon as I am ready” _____________________________________________________ 25. "Are you interested in this Language Center?” asked Lan. ____________________________________________________________ 26. “I must go now” The father said to us __________________________________________________________ 27. “We will spend our holiday in Dalat next month” said Chi. ______________________________________________________________- 28. “Who puts the salt in my cup of coffee?" asked Peter ________________________________________________________ 29. “Do you live here?” Liz asked. _______________________________________________________ 30. She asked me “Why do you come here late?” ______________________________________________________ 31. “What does your son want to learn?” I said to Linh. ______________________________________________________ 32. He asked the girl "Can you play the piano?" _____________________________________________________ 33. "You must come today" Hoa said. _____________________________________________________ 34. “I'm having a good time here" Said Mary. _____________________________________________________ 35. "I don't understand what you are saying” Tom said to us. _____________________________________________________ 36. Hoa told John “Do you like pop music?” _____________________________________________________ 37. They asked me, “What are you doing at 7 o'clock yesterday when we called you?" _____________________________________________________ 38. He asked her, “When do you leave this place?" _____________________________________________________ 39. We said, “What time dopes the plane arrive ?" _________________________________________________ 40. She said to me, “Did they tell you when they left? " _____________________________________________________ 41. She said, "Are you wearing your rain coat, Ann?" _____________________________________________________ 42. Mr Smith said to me, "Where are you going on your holiday?" _____________________________________________________ 43. His mother asked, "Who put these books here, John?" _____________________________________________________ 44. She said, “How do you go to the circus?" _____________________________________________________ 45. My mother asked, “How many classes are there in your school?" _____________________________________________________ 46." Are you going to visit your aunt tomorrow?" asked Tom. _____________________________________________________ 47. "Listen to me and don't make a noise," said to his students. _____________________________________________________ 48. “The sun always rises in the east" said our teacher. _____________________________________________________ 49. "I didn't steal your fur coat yesterday" said Mai to Ba. _____________________________________________________ 50. “Let me help you make the cakes," Judy said _____________________________________________________ 51. “You must do your homework every day," said Mrs. Brown to us. _____________________________________________________ 52. "Will we read the story?" Bill asked his teacher. _____________________________________________________ 53. Mike said, “I can't go to school today because I'm ill” _____________________________________________________ 54. Peter complained, “I haven't caught any fish at all.” _____________________________________________________ 55. Van said “I don't know where Ann is." _____________________________________________________ NHỚ GIẢI THÍCH CÂU NÀO LÀ CÂU HỎI NHA KO PHẢI THÌ KO CẦN GIẢI THÍCH:))) HỨA VOTE ĐẦY ĐỦ

viết công thức tính số số hạng và tổng

Hỗn hợp gồm Cu và Cuo với tỉ lệ 2:3. Cho 4 gam X vào dung dịch AgNO3 tới phản ứng hoàn toàn thu được a gan chất rắn. Viết phương trình hoá học và tính giá trị của a