Ai giúp mik đc ko ạ, còn có 7 câu nữa, đó là: 2. There is no school unifrom in VN 3. Classes last from seven to a quarter past eleven a.m 4. Students have a break after the second period 5. Most students play game at break 6. The school year begins in September 7. Summer vacation lasts for three months (Những câu này thuộc về bài 2 nha)

bài 2 tính A 11-7mũ2+22:2 B 9 . (8 mũ2-15) C 5 . 8-(17+8):5 D 75 : 3+6 . 9 MŨ2

P=(x^3+1)/(x^2-x+1)+(x+1)(2x-1)-(2x^3y+3x^2y)/xy với x=-2013, y=2014

giúp mik câu d,e với Hứa cho 5* và cảm ơn

Đề bài: Dùng từ gợi ý để viết thành câu hoàn chỉnh ở thì QUÁ KHỨ ĐƠN

I.Finish the second sentences so that they will have the same meaning as the preceding. 1. They have never met me before. I………………………………………………………………………………………….. 2. Tim has donated books to the poor. The poor………………………………………………………………………………………….. 3. Tim has helped the homeless since he moved to London. The............................................................................................................................ 4. Ba has sent me any mails since last Christmas. I................................................................................................................................ 5. I have never seen an alien before. => An……………………………………………………………………………..

11. He didn’t do this test last week because he was sick Because of………………………………………………………………………………… 12. Jane is a famous singer, He is a famous singer ( use Neither) Jane…………………………………………………………………………………… 13. I haven’t receiced the results of my test for a month It is ……………………………………………………………………………................... 14.He has never come here before Never……………………………………………………………………………………… 15. Unless she studies hard, She will not pass the exam If …………………………………………………………………………………………….. 16. I learned English when I was ten years old I have …………………………………………………………………………………….. 17. It is necessary for me to meet him tonight I ………………………………………………………………………………………….. 18. I was a good student last year, You were a good student last year. ( use : so) I…………………………………………………………………………………………

ai giúp em bài 5 ạ em cảm ơn nhiều ạ

a, Số 1990 có thể là tích của 3 số tự nhiên liên tiếp được không?

Bài 2.Tính: a) (2x-1,5)2 b) (5-y)2 c) (a-5b)(a+5b) d) (x- y+1)(x- y-1)