tìm cặp y,x thuộc N sao cho a, (3x-12)(y-5)= 0 b, (x-5)(2y+1) = 10

Xin các cao nhân giúp đỡ ạ... Em đang cần gấp

4. Chia các động từ trong ngoặc ra thì simple past hoặc present perfect: 1) We (studied)...............a very hard lesson the day before yesterday............................ 2) We (have studied)................................................almost every lesson in this book so far................. 3) We (have never watched)..........................that television program........................... 4) We (watched).....................an interesting program on television last night............... 5) My wife and I........................................(had travelled) by air many times in the past 6) My wife and I (travelled).................................. to Mexico by air last summer 7) I (have read)..................that novel by Hemingway sevaral times before. 8) I (read).........................that novel again during my last vacation. 9) I (had).........................a little trouble with my car last week. 10) However, I (have)......................... no trouble with my car since then. 11) I (have ) ………………..this toy since my birthday. 12) We (live )………………….in HN for ten years now and like it a lot. 13) The last time I (go) ……………………to HN was in May 14) When my parents were on holiday I ( stay)……………… with my aunt for a week 15) I (not see ) my son for ages .He (not visit ) ……………………..me since May 16) Tom ( be) …………….to HN twice .He loves it very much 17) My sister (work ) ……………………for an enterprise for two years .That was after college 18) I (move)……………… to HN in 2001 .I (be ) ………….there a long time now 19) It was so cold today that I (wear)…………… a sweater at school 20) So far this month there (be )……………………. three robberies in this street 21) When I was young I (meet )…………..him three times 22) In the past few years ,it (become )………….. more and more difficult to get into university 23) I (feel )………………better since I ( live) ……………….here 24) Since I (be ) ……………………in this city I ( not see)…………… him 5.Bài tập Hiện tại hoàn thành và Quá khứ đơn 1) I.........my Maths homework yesterday. (to do) 2).........Susan.........to England by plane? (to go) 3) They.........a farm two weeks ago. (to visit) 4) Jenny and Peggy.........their brother. (not/to help) 5) The children.........at home last weekend. (not/to be) 6) When.........you.........this wonderful skirt? (to design) 7) My mother.........into the van. (not/to crash) 8) The boys.........the mudguards of their bicycles. (to take off) 9).........you.........your aunt last week? (to phone) 10) He.........milk at school. (not/to drink) 11) The police.........two people early this morning. (to arrest) 12) She.........to Japan but now she.........back. (to go - to come) 13) Dan.........two tablets this year. (already/to buy) 14) How many games.........so far this season? (your team/to win) 15).........the CN Tower when you.........in Toronto? (you/to visit - to stay) 16).........your homework yet? – Yes, I.........it an hour ago. (you/to do - to finish) 17) There.........an accident in High Street, so we have to use King Street to get to your school. (to be) 18) I.........Peter since I.........last Tuesday. (not/to see - to arrive) 19) Frank.........his bike last May. So he.........it for 4 months. (to get - to have) 20) I'm sorry, I.........earlier, but I.........a lot lately. (not/to write - to work) 21) Peter......... football yesterday. 22) They......... the car. It looks new again. 23) Last year we......... to Italy. 24) John and Peggy......... the book. Now they can watch the film. 25) I......... my friend two days ago. 26) We......... another country before. 27) She......... a new car in 2011. 28) I'm sorry, but I......... my homework. 29)......... the game of chess? 30) The girls......... their lunch yet. 31) I.........my keys, so I can't open that door. (to lose) 32) Columbus.........in the New World in 1492. (to arrive) 33) Nina.........her leg. She is still in hospital. (to break) 34) He.........here all his life. (to live) 35) Colin.........for Brazil this morning. (to leave) 36) Last winter Robin.........with his father in the Alps for three days. (to stay) 37) Ellen.........with her left hand. (always/to write) 38) She.........a language course in Paris last summer. (to do) 39).........anyone.........yet? (to phone) 40) I.........Paul today, but I.........him last Sunday.

Ai giúp em với ạ .Em cảm sẽ cảm ơn và đánh giá 5 sao ạ

Rewrite the sentences use the adverbs of frequensy inbrackets

Giúp mình bài này với Tính giá trị nhỏ nhất của A=(x–8)^2–2018 Tính giá trị lớn nhất của B=–(x+5)^2+9

16+64x=16(3+2x) ?????????????????????

Giúp mìk đi 1.Why didn’t you either lock your car or put in into the garage?……………………………………………… 2.Didn’t they tell you to be here by 6 o’clock?…………………………………………………………… 3.A thief stole my dog and brought him back only when I offered $20 reward for him…………………………………… 4.Someone told me not to open the door.…………………………………………………………… 5.I will bring him to the court unless he pays me back $20 000.……………………………………… 6.It is rumoured that she has killed herself.…………………………………………………………… 7.He didn’t talk about anyone here.…………………………………………………………… 8.Nobody caught him unlock the safe.…………………………………………………………… 9.She never lets her children go out by themselves.…………………………………………………………… 10.He begins to take his children out in the evening.……………………………………………………………

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (21). Tran Dai Nghia (1913-1997) - The Buddha of Guns Professor, Academician Tran Dai Nghia is a (17) ______ scientist of Vietnamese intellectuals. In 1935, the young man Pham Quang Le, his real name, had a scholarship (18) ______ in France. He tried to take 6 college degrees and certificates of the most famous universities of France. Unlike the others, Pham Quang Le had a clear purpose when studying abroad. He studied the science (19) ______ making weapons to serve the country"s independence. The meeting between him and President Ho Chi Minh in Paris in 1946 changed the life of Pham Quang Le. In 1946, under the requirements of the (20) ______, he was assigned as Head of Military Department by Uncle Ho with the (21) ______ for researching, manufacturing weapons for our soldiers to fight the enemy. Uncle Ho said, “This is the good thing, so from now on your name is Tran Dai Nghia...” A: development B: responsibility C: work D: assignment

Giúp mình với ạ =(( sắp đến hanh chốt nộp ròi ấy ạ