Cho 21 gam hỗn hợp x gồm Zn và CuO vào 600 ml dung dịch h2 SO4 0,5 m, d= 1,1 gam / ml phản ứng vừa đủ thu được dung dịch x .tính nồng độ phần trăm của muối trong dung dịch x

ai làm giúp mình bài 3 mình cần gấp

Câu 1 : Chứng minh rằng với mọi số tự nhiên n thì : M = (n² - 3n -1 ) ( 2n + 1 ) - 2n³ + 1 chia hết cho 10

Ex 2. Rewrite the sentences, using so. 1. Because Hoa was rich, she could buy that house. 2. Because the rain was so heavy, I couldn't go to school. 3. His father asked him to go stay at home because he was sick 4. Because there was an accident, I was late. 5. She failed the University entrance exam because her grades were bad. 6. Mary didn’t go to school yesterday because she was sick. Ex 3. Rewrite the sentences, using the words given. 1. Because Hoa was rich, she could buy that house.( Because of) 2. Because the rain was so heavy, I couldn't go to school.(because of ) 3. His father asked him to go stay at home because he was sick. (Because of) 4. Because there was an accident, I was late.=> because of 5. She failed the University entrance exam because her grades were bad. (Because of ) 6. Mary didn’t go to school yesterday because she was sick. (because of ) 7. She went to bed early because she felt tired.( Because of) 8. Ann didn’t go to the circus with betty because she had a bad cold. (Because of ) 9. John succeeded in his exam because he worked hard and methodically. (because of ) 11. Margaret stayed home because her mother was sick. (Due to) 12. I like him because his father is kind to me. (due to) 13. I can’t study because it is noisy. ( owing to) 14. I can’t eat these fruits because they are green. ( because of) 15. The train came late because it was foggy. ( Owing to)

| $\frac{1}{3}$x-2|=| $\frac{1}{6}$x+1| Toán 7 Ạ

Structure: First conditional If + present simple, S + will(may/can/should/...) + V-inf. đặt ví dụ vs cấu trúc này giúp vs nhaaa, làm đúng có thưởng

Hãy kể tên 1 số văn bản đã học trong chương trình cũng sử dụng phương pháp lập luận như văn bản Đức tính giản dị của Bác Hồ

Bài 1 một thửa vườn hcn có chiều dài gấp 4 lần chiều rộng ,nếu giảm mỗi cạnh 2 m thì diện tích giảm 200 m^2 .Tính các thửa vườn đó

Anh/ chị hãy viết một đoạn văn (khoảng200 chữ) trình bày suy nghĩ về ý nghĩa của việc: “Muốn đi đến ngày mai, phải khởi hành từ hôm nay.”

Hãy nêu các cuộc kháng chiến của nhân dân ta từ thế kỉ X-XIV Giúp mk với ạ Cảm ơn các bạn nhiều