X² - 2(m+1)x +m² +3m+2=0

a) Giải phương trình với m= 1

b) tìm tất cả giá trị của m để phương trình có hai nghiệm phân biệt,kép, vô nghiệm

c) tìm các giá trị của m để phương trình có hai nghiệm phân biệt x1,x2 thỏa mãn x₁²+ x₂² = 12

So sánh NST thường và NST giới tính

a) phân biệt cấu trúc ADN và ARN

b) ADN và ARN được tổng hợp dựa trên những nguyên tắc nào

c) nêu bản chất của mối quan hệ ADN -> ARN->Protein-> tính trạng

Cho hai giống cà chua đỏ và vàng giao phối với nhau ngưòi ta thu được F1 là cà chua đỏ tiếp tục cho F1 thụ phấn người ta thu được F2

a) Biện luận và viết sơ đồ lai từ P đến F2

b) cho F1 lai phân tích thì kết quả của kiểu gen và kiểu hình như thế nào

Lai phân tích là gì . Người ta dùng lai phân tích trong trường hợp nào

Trình bày phương pháp thế hệ lai của menden. Phát biểu qui luật phân li và phân li độc lập

Tóm tắt bài này hộ mk với đầy đủ ý nhé

For centuries, poets, writers and musicians have mentioned the ao dai in poems, novels and songs. The ao dai is the traditional dress of Vietnamese women. It consists of a long silk tunic that is slit on the sides and worn over loose pants. Traditionally, it was frequently worn bv both men and women. The desian and material used for men were different from those used for women. Nowadays, women usually wear it, especially on special occasions. However, many Vietnamese women today often prefer to wear modern clothing at work, because it is more convenient.

Now fashion designers want to change the traditional ao dai. Some have printed lines of poetry on the ao dai, so they look modern and very fashionable. Other designers have taken inspiration from Vietnam’s ethnic minorities.

They have visited villages and studied traditional designs and symbols such as suns, stars, crosses, and stripes. They have added these patterns to the ao dai, so Vietnamese women can continue to wear the unique dress, which is now both traditional and fashionable

Hòa tan hoàn toàn 13g Zn bằng m(g) dung dich HCL 20% vừa đủ

a) viết PTHH

b) Tính V h2 (dktc) thu dc

c) tính m2

make conditinal sentences

1. she got married at such an early age' so she isn't at university now

2. she works in the evening , she has no time to play with her children

3. as she is often absent from class, she can't keep pace with her classmate

4. it's very cold' so we can't go swimming

5. you drink too much coffee ' that's why can't sleep

6. we don't have a big house. we can't invite friends to stay

7. the flats are not clearly numbered, so it is very difficult to find anyone

8. i couldn't write to Alice because i didn't know her address

9. we got lot because we didn't have a map

10. the farmers didn't have enough rain , so they could not grow rice

11. his friends were late so they missed the train

12. make me some coffee, and i'll give you one of my biscuits

13. you won't ask the teacher . he won't explain the lesson to you

14. city life isn't enjoyable because eveything is very expensive

15. i didn't bring extra money with mw because you didn't tell me we were going to diner after the movie

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Higher education is very importance to national economies and it is also a source of trained and educated personnel for the whole country

A. importance

B. economies

C. educated

D. the whole country