- Suy đoán nguyên nhân dẫn đến sự di cư của một bộ phận dân cư Hoa Kì từ vùng phía Nam hồ Lớn và vùng Đông Bắc ven Đại Tây Dương xuống phía Nam và Duyên hải Thái Bình Dương?

A=(x-y-z)-(-x-y-z) Rút gọnA Tính giá trị của A khi : x=-1; y=-101; z=-202

B1:Các cặp số nhau bằng nhau ko? Vì sao a.-4/12 và 1/-3; b.5/7 và 7/5; c.9/12 và -9/11; d. 1/2 và -3/6. Bài mẫu : a. ta có -4.<-3>=+12 12.1=12 do đó -4 . <-3>=12.1=12 nên -4/12=1/-3 Các bạn dựa bài mẫu làm tương tự giúp mình nha.thanks you very much

bài 2 làm như nào vậy giúp mình ạ

Ai giải giúp mk bài 10,11,12,13 này nhé.thank you👏👏👏

bạn nào biết làm b3 này giúp mình ạ

1. He last phoned me in august --> He hasn't 2. It's ages since i saw her --> I haven't 3. I have never been here before --> It is the first 4. She last wore that dress at her sister's wedding -->She hasn't 5. They haven't phoned us for a month --> It is 6. The last time i met Ba was in 2008 --> I haven't 7. I haven't seen my brother for a month --> I didn't 8. I last saw Nam two years ago --> I haven't 9. The last time she went out with him was o months ago --> It is 10. It's three years since I last saw Nam --> I haven't 11. The last time she visited me was five months ago --> She hasn't 12. I last wrote to my uncle in july -->I haven't 13. It's a long time since we became close friends --> We have 14. Minh last wrote to his pen pal five months ago --> Minh hasn't 15. He hasn't chatted with his classmates through the internet for ages --> It's ages 16. We haven't seen her since we left uniersity -->The last time 17. I haven't written to you for a month --> I last

mn giải giùm em ạ em cần gấp ạ em cảm ơn nhiều III. Verb form: 1.We suggest he _____________________________ the test again.(do) 2.They suggested _____________________________for a walk.(go) 3.I remember _____________________________ the gate .Why is it unlocked now ? (lock) 4.Why not _____________________________ another product?(choose) 5.The song _____________________________ for 30 years now.(sing) 6.If you heat water at 100o c, it _____________________________.(boil) 7.It’s necessary that she _____________________________Spanish.(study) 8.He insisted that Mr.Bean _____________________________betteer.(act) 9.She has three days there.She _____________________________ many places of interest.(visit) 10.You must know the area well.You _____________________________ here for 5 years.(live) 11.If you _____________________________out, you should bring along a raincoat.(go) 12.It is suggested that he _____________________________here now.(be) 13.This action helps _____________________________energy.(save) 14.If you go on _____________________________, you will be terribly fined.(litter) 15.We look forward to _____________________________ fairly.(treat) 16.I let my friend _____________________________ my bike yesterday.(borrow) III.Rewrite the following sentences without changing the meaning: 1.You need to attend the course. It’s __________________________________________________________ 2.You should reduce the volume at night. You should turn _______________________________________________ 3.I am on the tenth page of the letter I am writing. So far _______________________________________________________ 4.You are not allowed to turn on that machine. You must ____________________________________________________ 5.We got up late, so we missed the first period. Since ________________________________________________________ 6.They are so lazy that they failed the exam. They failed ___________________________________________________ 7.You should do exercise or you will have fat in your blood. If you don’t ___________________________________________________ 8.It would be better if you stop here.  I suggest _____________________________________________________

Ai giúp mk bài 70 với Nhanh lên mk cần ngay bây giờ rùi Ai nhanh nhất mk vote 5 sao Thanks

Trên đường thẳng xy lấy một điểm O. Vẽ tia Om sao cho xOm= 90 độ vẽ tia On nằm giữa hai tia Om và Oy. Tìm trên hình vẽ: a) Các cặp góc phụ nhau; b) Các cặp góc bù nhau