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Thầy cô giúp em giải bài tập này với. hjc khó quá: Cần lấy bao nhiêu gam nước và bao nhiêu gam tinh thể hiđrat có công thức XY.10H 2 O với khối lượng mol là 400g, để pha trộn một dung dịch bão hòa ở o 90 C mà làm lạnh đến o 40 C sẽ lắng xuống 0,5 mol tinh thể hiđrat có công thức XY.6H 2 O. Cho biết độ tan của muối khan XY ở o 90 C là 40, ở o 40 C là 60 Cho tam giác ABC nhọn nôi tiếp (O) Hai đường cao BE, CF cắt H AH cắt (O) D a b c d CM: tứ giác BFEC nội tiếp CM : tam giác BHD cân Gọi k trung điểm AH CM: tứ giác BDEK nội tiếp Gọi giao điểm EF AH I CM: I trực tâm tam giác KBC tính thể tích khối hộp ABCD A’B’C’D’ theo a khi biết AA’B’D’ là khối tứ diện đều cạnh a QUESTIONS FOR SPEAKING 4 Chapter 1 New Challenges 1. Talk about your own experiences learning a new language ? What are some of your difficulties / challenges in studying English ? How have you overcome them ? 2. What are some of your accomplishments from the last five years ? What have you done to achieve ? What is the biggest challenge ? The biggest reward ? 3. What do you hope to have accomplishsd in the next five years ? What do you think the most challenging thing ? 4. What are your short- term goals ? What are you going to do to achieve these goals ? 5. What are your long- term goals ? What do you plan to do to overcome your obstacles ? Chapter 2 Coope. ration and Competition 1. What are the advantages and disadvantages of working in groups? 2. Do you think that working independently is better than working cooperatively ? Why ? Why not ? Explain your reasons . 3. Which sports depend on cooperation? which sports are based on competition? why? 4. What does working in groups teach you that you can't from wofking alone? why? 5. how does working in groups promote social skills ? explain Chapter 3 Relationship 1. Who do you admire ? What is your relationship with this person ? Why do you admire him / her ? 2. Do you want to live in the nuclear family or an extended one ? Explain your reasons ? 3. What are the benefits and drawbacks of your birth order in your family ? Do you believe that your position in your family is an important factor that made you the way you are today ? Explain your choice . 4. Who do you love the most in your family ? Why ? 5. Who is your best friend ? What are your friend’s best qualities ? How is your friend similar to or different from you ? What do like most about your friend ? Can he / she make a big difference in your life ? Explain your choice . Chapter 4 Health and Leisure 1. Think about your current lifestyle. Is it a healthy one ? What do you do to take care of your health ? Is there something that you are addicted to ? 2. Why do people in your country smoke ? What are some negative effects of smoking ? Give some pieces of advice to smokers. 3. What would you tell a compulsive shopper to control his or her urge to buy things ? 4. What do you do to reduce your stress ? 5. What do you do to stay healthy ? 6. What should you do to lose / gain weight ? 7. Tell some common diseases in your region ? How do people treat these diseases ? Chapter 5 High Tech, Low Tech 1. What kinds of media do you have in your family ? Which one is the most important to you ? Why ? 2. What is you favorite new technology ? How is it used today ? 3. What gadget couldn’t you absolutely live without ? Why ? How was it used in the past or what was used instead of it ? How has this item modified or changed in recent years ? 4. What are some advantages and disadvantages of using computers ? 5. What is Internet ? What are the advantages and disadvantages of Internet ? a. a computer network consisting of a worldwide network of computer networks that use the TCP/ IP network protocols to facilitate data transmission and exchange . b. The Internet is a global system of interconnected computer networks that use the standard Internet Protocol Suite ( TCP / IP ) to serve billions of users worldwide . Ở một loài thực vật, cho giao phấn giữa cây hoa đỏ thuần chủng với cây hoa trắng được F 1 toàn hoa đỏ. Tiếp tục cho F 1 lai với cơ thể đồng hợp lặn được thế hệ con có tỉ lệ 3 cây hoa trắng : 1 cây hoa đỏ.Cho 1 cây F 1 tự thụ phấn được các hạt lai F 2 , Xác suất để có đúng 3 cây hoa đỏ trong 4 cây con là bao nhiêu : A. 0,31146 B. 0,177978 C. 0,07786 D. 0,03664