th1 :75

th2 : 168

th3 : 225

ta có :BCNN(x,y) . ƯCLN(x,y) = x . y

=> x .y = BCNN(x,y) . ƯCLN(x,y) = 336 . 12 = 4032

vì ƯCLN(x,y) = 12 nên ta đặt x = 12 . x'     ; y = 12 . y'

ta có : x . y = 12 . x' . 12 . y' = (12 . 12) . x' . y' = 4032

=> x' . y' = 4032 : (12 . 12) = 28

vì x > y nên x' > y' và ƯCLN(x',y') = 1

=> 

vậy các cặp số x,y cần tìm là : 336 và 12; 84 và 48

năm 1974 đứng nhé mình thử ở violymic rồi đúng luôn

II. Tự luận:

Câu 1: Sau thụ tinh quả và hạt do bộ phận nào của hoa tạo thành?

.......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

Câu 2: Em hãy sắp xếp các quả sau vào nhóm quả khô, quả thịt: quả cải, dưa hấu, đu đủ, quả me, quả mận, quả phượng, quả ổi, bơ, quả cam, quả khế.

giúp mik nha

III. Phân biệt các nhóm quyền của trẻ em được quy định trong Công ước: (4,0đ)

giúp mik vs

A(min)=2009 khi \(2\le x\le2011\)

1. Ba and I (be).............. students. We (go).................. to school in the morning.

2. We (not go)............. to school on Thursday.

3. Lan (be)................... a student. She (go)................. to school in the afternoon.

4. She (not go).................... to school in themorning.

5. My school (be)........... in the country. There (be).......... 14 classrooms in my school.

6. There (be).......... a bookstore opposite my house.

7. There (be).......... two restaurants near my house.

8. Where (be).......... your father now? - He (take)........................ a shower.

9. My brother (be)............ a policeman. He (work).................. in Ho Chi Minh City.

10. Today he (not work)....................... He (play)....................... tennis with his friends.

11. What (you/do).................................... after school? - I (watch)...................... TV.

12. What (you/do).......................................... now? - I (watch)........................... TV.

13. What (Lan/do)................................. after school? - She (watch)..................... TV.

14. What (Lan/do)....................................... now? - She (watch).......................... TV.

15. My mother (not work)......................... in a hospital. She (work).............. in a clinic.

16. How (your mother / travel)...................................... to work? - She travels by train.

*Supply the correct forms and tenses of these verbs:

1. We to the movie theater by bus now. (go)

2. They _ at school. (be not)

3. What Mr Allen ? (do)

4. He usually TV in the evening. (watch)

5. Can we _ soccer on the streets? (play)

mong các bn giúp mik mơn m.n

3. You (5- like) this skirt? I (6- give) it to my daughter for her birthday tomorrow.