giúp mình với cảm ơn nhiều ạ huhu

Tính tổng S=11^2+13^2+...+2009^2

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Trong (Oxy) cho hinh vuong ABCD co A(0;2), C(4;0).Tìm toạ độ B,D.

hoocmon là sản phẩm tiết của loại tuyến nào ?

cho 1 lượng sắt dư phản ứng vào 100ml dung dịch H2SO4, sau phản ứng thu được 3,36 lít khí H2( ở điều kiện tiêu chuẩn ) a.viết PTHH xảy ra b.tính khối lượng Fe sau phản ứng c.tính nồng độ mol của dung dịch H2SO4 đã dùng

Hãy tìm lỗi sai trong các câu sau rồi chữa lại và hãy giải thích vì sao : 1) The Sydney Opera House is a (symbolize) (for) not only a city, (but) (a whole) country and continent. A B C D 2) Noise pollution (is) thought (having) less damage (to) humans (than) water or air pollution. A B C D 3) If people keep (cutting) down trees and (they wipe) out forests, there (will be) more (floods.) A B C D 4) (Have you) come (home) before the tornado (touched) down (this afternoon)? A B C D 5) (The) timetable (shows) that the next bus (will leave) (in ten minutes.) A B C D

Mọi người giải nhanh giúp mình nha! Mình sẽ vote 5 sao!

C. TENSE : Give the correct tense of the verbs in brackets to complete the following passages a. Mrs Quyen (26.be)…….a short story writer . Several books of short stories (27write )………She (28.win)……..several rewards for her books .A few years ago , she (29.receive)……..the prize for the most promising author of the year . At the moment , a detective story (30.write) by her . 31. Nowadays , many historical places (destroy) seriously 32. My mother (not visit )……..us since she (move )…….to the new town 33. It (get )………hotter and hotter in June 34. There ‘s some behind us . I think we (follow)…………. 35. Last month when we ( visit ) ………..him, he (do) an experiment on the upstairs C. : 1. Odd one out 36 .a. great b. hate c. heat d. afraid 37. a. sure b. sight c. sale d. soil 38. a. exchange b. brochure c. challenge d. charity 39. a. ordered b. published c. impressed d. escaped 40. a. courses b. classes c. watches d. temples 36…….. 37……….. 38……… .39………….. 40…………… 2 .STRESSED : Choose a word in each group that has different stress pattern 41. a. celebration b. federation c. imagination d. inspiration 42. a. Japan b. Australia c. Britain d. Canada 43. a. happen b. local c. expect d. wander 44. a. despite b. dentist c. destroy d. describe 45. a. weather b. lave c. middle d. delicious Read the following passage and fill a suitable word in each blank LONDON TRANSPORT Public transport (46)……London is expensive. The fare depends on the length of the ……(47); You can’t buy books of tickets in …(48)… Children under 16 pay half ; (49)….children under five travel free. But (50)…some buses you pay the driver. Most London (51)…..are double – deckers .On the underground railway (or tube) you (52)…..your ticket from a machine or at the (53)….of the journey. Not all trains from one flatform go to the (54)….. place so the signs. The (55)…….train leaves at about 00 46………………… 47…………… 48…………………… 49………………… 50……………… 51…………………… 52………………… 53………………... 54…………………… 55………………… D. WRITTNIG 56. The film was so interesting that we watched it several times - It was ........................................................................................................................................... 57. Write your name here -Let ............................................................................................................................................... 58. People think that computer games are harmful -It is ................................................................................................................................................ 59. We couldn’t drive fast because of the fog -The fog ........................................................................................................................................ 60. It is a pity she can’t speak French fluently -She wishes..................................................................................................................................... E. MAKE SENTENCES BASED ON THE CUES 61. If/ Susan/ eat/ much/ chocolate / she/ would/ be/ overweight ........................................................................................................................................................ 62. We /extreme /tired/ after/ trip/ so/ sleep/ bus/ way/ home. ........................................................................................................................................................ 63. Lan / Viet/ if/ could/ lend /ruler. ........................................................................................................................................................ 64. Living room/ paint/ at the moment. ........................................................................................................................................................ 65. Tet / be/important/ festival/ which/ occur/late January/ early February. ........................................................................................................................................................

Tìm số tự nhiên có 2 chữ số, biết rằng chữ số hàng đơn vị lớn hơn chữ số hàng chục là 4 đơn vị và nếu đổi chỗ hai chữ số cho nhau thì được số mới bằng số ban đầu