Bài 15: Cho m gam dung dịch HCl 14,6% tác dụng với 29,1 gam hỗn hợp Cu và Zn, có tỉ lệ số mol tương ứng là 1:2. Sau phản ứng thu được dung dịch A và V lít khí ở đktc. Để trung hòa lượng axit dư có trong dung dịch A cần dùng 120 ml dung dịch NaOH 0,4M. Tính m và V. Sẵn ai giải thích cho mình chỗ tỉ lệ 1:2 có nghĩa là gì với nhé^^

Câu 2 ạ giúp mình mình đang gấp

không dùng máy tính hoặc bảng số hãy tính: sin 22°30' ,cos 22°30' ,tan 22°30' Giúp mình vs ạ mình cần gấp

phân tích đa thức thành nhân tử x^3-7x-6 Yêu cầu: Làm nhanh, dễ hiểu

Giải các phương trình: a) √(x - 1)² = 4 b) √(x-1)^4 = 4

Exercise 13. Rewrite the following sentences in the way that their original meanings do not change. 1. We will use renewable energy in the future. Renewable energy 2. This is our school. This school is 3. What is the distance between Vinh and Ha Noi city? How 4. I often walked to school when I was a student. I used 5. Although they are short, they still love playing sports. In spite of 6. They will use solar energy to protect the environment. Solar energy 7. Although she eats lots of food, she is still very slim. In spite of 8. What is the distance between Hanoi and HCM city? How far 9. I find English interesting. Iam 10. Our roof will be fixed tomorrow. They

ai nhanh nhat dc 5* va CTLHN nhe

Chỉ ra và viết một đoạn văn phân tích tác dụng của các biện pháp tu từ được sử dụng trong đoạn thơ sau: “Quê hương là vàng hoa bí Là hồng tím giậu mồng tơi Là đỏ đôi bờ dâm bụt Màu hoa sen trắng tinh khôi Quê hương mỗi người chỉ một Như là chỉ một mẹ thôi Quê hương nếu ai không nhớ...” (Bài học đầu cho con - Đỗ Trung Quân)

Exercise 12. Rewrite the following sentences in the way that their original meanings do not change. 1. Governments will make more regulations to reduce industrial pollution. → More regulations 2. People won’t burn fossil fuels for energy in the future. → Fossil fuels 3. People will construct more wind turbines in that area to produce electricity. → More wind turbines 4. Shall we reduce our electricity bills to 20% in five months? → Will our electricity 5. People will develop alternative sources of energy. → Alternative sources 6. We will be providing electricity this time next year. → Electricity 7. Scientists will find solutions to reduce pollution in our city. → Solutions 8. They will increase the tax on petrol to 15% next September. → The tax 9. With that device people will change the wave energy into electricity. → With that device the wave energy 10. We shall replace ordinary 100- watt light bulls with energy- saving ones. → Ordinary

Exercise 11. Rewrite the following sentences in the way that their original meanings do not change. 1. They will install solar panels on the roof of our house next week. → Solar panels 2. They will build a new school for poor children next month. → A new school 3. Will the plumber check cracks on the water pipes in two days? → Cracks 4. They sell these chemicals everywhere in my hometown. → These chemicals 5. They won't show the film on types of future energy sources next Friday. → The film 6. Some people will interview the new president on TV. → The new president 7. They will destroy the old thermal power plant at the end of this year. → The old thermal 8. They will widen the road to our village next year. → The road 9. We will be using biogas for cooking and heating at this time next month. → Biogas 10. They got the first prize at the competition. → The first