Tìm các số nguyên tố x, y sao cho: x² + 45 = y² ....................

var S: integer; i: byte; a: array[1..20] of integer; begin clrscr; S:=0; write(‘Nhap vao phan tu thu i: ‘); readln(a[i]); for i:=1 to 20 do begin if (a[i] mod 5 = 0) and (i >0) then S:=S+a[i]; write(‘Tong la: ‘,S:3); end; readln; end. _________________________________________________ Chỉ ra và sửa lỗi sai.

Mọi Người Giúp Em Với, Không Cần Thiết Phải Làm Hết Đâu Còn Làm Hết Thì Tốt Quá Ạ. Em Cảm Ơn Nhiều <3

21. I see some girls ________ are pretty. A. whom B. which C. who D. they 22. Give back the money ________ you took. A. it B. who C. whom D. which 23. He was killed by a man ________ friends we know. A. whose B. which C. whom D. that 24. He spoke to the messengers with ________ you were leaving. A. which B. whom C. whose D. that 25. We captured a town ________ is in Spain. A. whom B. where C. which D. it 26. The farmers ________ we saw were in the field. A. whose B. which C. they D. whom 27. The women ________ I gave the money were glad. A. to whom B. to that C. for whom D. for that 28. I know a boy ________ name is John. A. who B. whose C. whom D. that 29. The man ________ you sent to the general has reported the victory. A. whose B. which C. whom D. he 30. I saw those slaves ________ had been led to the city. A. whose B. which C. whom D. who

2. Tìm tất cả các số tự nhiên , n để phân số 18n+ 3/21n + 7 có thể rút gọn được ,,,,,,,,,,,,,,,,,,,,,,,

cho a-b+c=2 a^2+b^2+c^2=4 x/a=-y/b=z/c CMR xy+yz+zx=0

1. My room ________ every day. * 1 điểm is cleaned was cleaned has been cleaned were cleaned 2. The town ________ by an earthquake last month. * 1 điểm were destroyed were being destroyed was being destroyed was destroyed 3. Thank you for inviting me to the rice-cooking ________. * 1 điểm holiday festival tour excursion 4. Liz is very ________ in the water-fetching contest. * 1 điểm interest interested interesting interests 5. I said that I ________ my own apartment. * 1 điểm have has had having 6. They have to ________ the rice from the husk and then cook the rice. * 1 điểm take up get out separate divide 7. I telephoned the station to make ________ of the time of the rain. * 1 điểm sure true real right 8. Many years ago, Christmas songs ________ for people in towns and villages. * 1 điểm performed were performed were performing have performed 9. The children were ________ table-tennis while it’s raining. * 1 điểm playing doing making taking 10. My neighbor has ________ bought a washing machine. * 1 điểm yet just been no

Giúp mik vs mình đag cần gấp ! Cảm ơn các bạn nhìu

Cap 5 Linda: What time do you go to bed? Nam: I go to bed at ten o cloch p.m about you Ex 3: Anoner there questions 1.Whed time io it now ? 2.What time do you get up? have be breahtast ? you 4.What time do you have lumch ? 3. What time do. 5.What do you do ater dinner ?

11. The painting_________Ms. Wallace bought was very expensive. A. whom B. whose C. which D. where 12. The homeless people_____story appeared in the paper last week have now found a place to live. A. who B. whom C. that D. whose 13. __________ is your favourite sport, swimming or running. A. What B. Which C. Whom D. Whose 14. Were the Wright brothers the ones __________built the first aeroplane? A. which B. whom C. whose D. that 15. I don't like stories________ have unhappy endings. A. where B. which C. they D. who 16. The periodic table contains all the elements, ________ has a particular atomic weight and atomic number. A. which of each B. each of which C. which each D. each 17. Ansel Adams was a landscape photographer ________ photographs of the western United States show nature on a grand scale. A. whose B. of whom C. of his D. his 18. Jan didn't check she had enough petrol before she left, ________ was careless of her. A. what B. it C. that D. which 19. This is a town ________ many people live. A. in which B. which C. at which D. on which 20. She, ________ is your sister, lives far away. A. which B. who C. whom D. she