Trong đoạn trích : " Chị Em Thúy Kiều " có đoạn :
Cung thương làu bậc ngũ âm
Nghề riêng ăn đứt hồ cầm một trương
Khúc nhà tay lựa nên chương
Một thiên bạc mệnh lại càng não nhân
1. So sánh nghĩa của từ " trương" và " chương"
2. "Khúc nhà" và " một thiên bạc mệnh " dùng để chỉ một đối tượng hay hai đối tượng
3. Giải nghĩa "não nhân"

ADN có tổng số lượng nu là 15000 nu, tổng số liên kết hidro là 19500

a,tính A,T,G,X

b,Tính khối lượng của ADN

c,Tính chiều dài của ADN

Bài 1: Cho A=\(\left(\dfrac{x-y}{\sqrt{x}-\sqrt{y}}+\dfrac{\sqrt{x^3}-\sqrt{y^3}}{y-x}\right):\dfrac{\left(\sqrt{x}-\sqrt{y}\right)^2+\sqrt{xy}}{\sqrt{x}+\sqrt{y}}\)với x≥0; y≥0; x≠y

a) Rút gọn A

b) Chứng minh A≥0

Bài 2:Cho A= \(\dfrac{x\sqrt{x}-1}{x-\sqrt{x}}-\dfrac{x\sqrt{x}+1}{x+\sqrt{x}}+\left(\sqrt{x}-\dfrac{1}{\sqrt{x}}\right).\left(\dfrac{\sqrt{x}+1}{\sqrt{x}-1}+\dfrac{\sqrt{x}-1}{\sqrt{x}+1}\right)\)

với x>0; x≠1

a) Rút gọn A

b)Tìm x để A=6

a, (x-1)(x+3) <0

TH1: x-1<0<=>x<1

x+3>0<=>x>-3

=>-3<x<1

TH2: x-1>0<=>x>1

x+3<0<=>x<-3

=>Vô lý

Vậy S={x|-3<x<1}

b,(2x-1)(x+2)>0

TH1: 2x-1\(\ge\)0<=>2x\(\ge\)1<=>x\(\ge\)\(\dfrac{1}{2}\)

x+2\(\ge\)0<=>x\(\ge\)-2

=>x\(\ge\)\(\dfrac{1}{2}\)

TH2: 2x-1<0<=>2x<1<=>x<\(\dfrac{1}{2}\)

x+2<0<=>x<-2

=>x<-2

Vậy S={x|x<-2 hoặc x\(\ge\)\(\dfrac{1}{2}\)}

c, \(\dfrac{3x-2}{2x-1}\)>0 (Tử và mẫu cùng dấu)

TH1 3x-2\(\ge\)0<=>3x\(\ge\)2<=>x\(\ge\)2

2x-1>0<=>2x>1<=>x>\(\dfrac{1}{2}\)

=>x\(\ge\)2

TH2: 3x-2<0<=>3x<2<=>x<\(\dfrac{2}{3}\)

2x-1<0<=>2x<1<=>x<\(\dfrac{1}{2}\)

=>x<\(\dfrac{1}{2}\)

Vậy S={x|x\(\ge\)2 hoặc x<\(\dfrac{1}{2}\)}

d,\(\dfrac{3x+2}{x+1}>2\)

<=>\(\dfrac{3x+2}{x+1}-2\)>0

<=>\(\dfrac{3x-2-2x-2}{x+1}\)>0

<=>\(\dfrac{x-4}{x+1}\)>0 (Tử và mẫu cùng dấu)

TH1: x-4\(\ge\)0<=>x\(\ge\)4

x+1>0<=>x>-1

=>x\(\ge\)-4

TH2: x-4<0<=>x<4

x+1<0<=>x<-1

=>x<-1

Vậy S={x|x\(\ge\)-4 hoặc x<-1}

Viết đoạn văn khoảng 10-12 câu theo hình thức tổng - phân - hợp nêu cảm nhận và suy nghĩ của em qua khổ thơ thứ 3. Trong đó có sử dụng ít nhất 1 câu cảm thán và 1 câu trần thuật

Viết đoạn văn khoảng 10-12 câu theo hình thức tổng phân hợp nêu cảm nhận của em về tâm trạng người tù qua khổ thơ 2. Trong đoạn có sử dụng ít nhất 1 câu cảm thán và 1 câu trần thuật( gách chân các câu đó)

Giúp mình nhé!

1. The temperature of water increases. Many fish in the river die ( since)

2. People use too much herbicide to treat weeds. Water in rivers and canals are extremely polluted and has bad effects on people's health( Because)

3. Water in the Cau River becomes brown and has terrible smell. The waste is realeased from the paper mill in Thai Nguyen city

4. Plastic bags take so long to decompose. Nearly all of them still exist in the environment today

5. The noise from the music club is loud. The residents of the street cannot sleep( because of)

6. Aquatic life suffers or dies. There is thermal pollution( because of)

7. It rained heavily. The road in front of my house was flooded( due to)

8. Noise pollution is one of the major of stress and anxiety. People suffer from stress and anxiety( due to)

9. Global warming happens. There is too much carbon dioxide in the atmosphere( causes)

10. Light pollurion occurs. We are unable to see the stars in the sky( makes)

11. Air pollution happens. There are asthma, allergies and other respiratory illnesses

12. The tsunami happened. Many people in this area became homeless( made)

13. Contamination in the air happens. There is acid rain which damages soil, vegetation and aquatic life of the region( results in)

14. The food is contaminated. Pople's health is poor( results in)

1. Carnival is a popular festival in many countries in South Amaerica. (festive)

2. It usually happens in February, and South American people celebrate it in different ways. (celebration)

3. The Rio Carnival is the biggest and most famous, with most lively celebration (celebrate)

4. It gives people a chance to learn about the true culture of Brazil. (cultural)

5. People wear costumes and parade through the streets, playing samba music and dancing. (parade)

6. The highlight of the Rio Carnival is the Samba Parade with thousands of samba performers from various samba schools. (perform)

7. A lot of cultural and artistic activities are held as part of the Flower Festival in Dalat. (culture/ artist)

8. There is a special celebration for Japanese girls on March 3rd every year. (celebrate)

9. I saw a parade of flower floats when I attended the festival last year. (attend)

10. I love the performance of folk songs. (performer)

11. We had a celebratory meal on my grandfather’s birthday. (celebrate)

12. The christmas season is also called the festive season. (festival)

13. Villages voluntarily contribute money and other things to celebrate the festival. (volunteer)

14. The festive atmosphere is felt around all the villages. (festival)

15. There are some other activities such as cultural shows,buffalo races, and traditional games. (culture/ tradition)

16. La Tomatina is a seasonal festival to celebrate the tomato harvest. (season)

17. Halloween is a festival. People often put pumpkin lanternsoutside their house. (religion)

18. solar energy is renewable. Moreover it is clean and safe. (sun)

19. Biogas is mainly used for cooking and heating. (cook/ hot)

20. People in mountainous are have to gather wood to use as fuel. (mountain)

21. Biogas helps solve the problem of indoor air pollution. (pollute)

22. In the future, the wind and the sun will be used as the main environmental friendly energy sources. (environment)

23. Many poor people in developind countries have little electricity. (electric)

24. _________,fossil fuels are harmful to the environment. (fortunate)

25. We are looing for cheap, clean and efficiently sources of energy. (effect)

26. We shouldn’t waste natural resources. (nature)