chứng minh rằng nếu a^2+b^2=c^2 thì (ka)^2+(kb)^2=(kc)^2 a,b,c là số nguyên

đặt tính rồi tính a)3456+1234=? B)3544-2444=? giúp với

giúp mik khoanh 3 câu này với nha :3 Mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions. Question 3. Peter_______ have lunch in the school canteen when he was in grade 6. A. used to B. was used to C. gets used to D. is used to Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of stress in each of the following questions.Question 14. A. agree B. open C. reduce D. return Mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions. Question 7. We _______ each other at my aunt's house three years ago and _______ friends ever since. A. met/ had been B. met/ have been C. met/ are D. meet/ were *

1/2.(-3)/4.(-5)/8.(-8)/9 6/5+1/6:(-3) 7/8:5/4.(-10)/7

Giúp mình với ạ. Mình cảm ơn nhiều

Viết phân số sau thành phân số thập phân, có mẫu số là, $100$ $\dfrac{64}{800}$

Fill in the blank with correct forms of a suitable verbs (study, have, do, play) to complete the following sentences. 1. He is ……………………. hard at the moment 2. They ……………………... a beautiful home. 3. You can take the documents home and ……………………... them at your leisure. 4. He ……………………..…….. plenty of money but no style. 5. Jane ……………………..…….. the guitar and her brother is on percussion. 6. Nga is ……………………... to be an architect.7. Can I ……………………..… a drink of water? 8. Diane is ……………………..…….. anthropology at university. 9. I can’t go out tonight – I’ve got to ……………………..…….. my history paper. 10. Which team do you ……………………..…….. for?

II. Choose the best answer A, B, C or D to complete each sentence. 1. British author George Orwell ……………. the novel Animal Farm. A. writes B. wrote C. is written D. was written 2. My passport ……………… last year while I was on vacation. A. stole B. has stolen C. was steal D. was stolen 3. Breakfast ………………. in this hotel until 7 a.m. A. served B. didn’t serve C. isn’t served D. isn’t serving 4. Most email accounts at my company ……………. by virus two days ago. A. affected B. were affected C. was affected D. are affected 5. Someone ……………… this mirror last night. A. breaks B. is broken C. broke D. was broken 6. Look at this beautiful lace! Where …………….? A. was it made B. does it make C. did it make D. is it made 7. The school …………… two examinations every year. A. holds B. held C. is held D. was held 8. The Temple of Literature ………….. in 1070 by Emperor Ly Thanh Tong. A. found B. has founded C. was found D. was founded 9. The committee …………… a public transportation proposal. A. consider B. is considering C. considered D. was considered 10. Everybody ……………… by the terrible news yesterday. A. shocked B. has shocked C. was shocked D. were shocked

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