Một dung dịch chứa 0,01 mol $Cu^{2+}$ , 0,02 mol $K^{+}$ , x mol $Cl^{-}$ và y mol $SO_{4}$$^{2-}$ . Tổng khối lượng các muối tan có trong dung dịch là 3,09 g . Giá trị của x và y lần lượt là bao nhiêu ?

Câu 5: (1 điểm) a, Tính giá trị cụ thể , hãy so sánh 2 phân số sau 2011113/2011114 và 2011114/2011115 b, Có 1 bình 4 lít và 1 bình 5 lít . Làm thế nào để lấy được đúng 3 lít nước từ 1 bể?

Giải giúp mik bài 2 ai giải chi tiết đầy đủ nhất mik vote cao nhất ( vì mik mới hok lên trả lời chi tiết sẽ được vote full )

. Cho 2,16 gam kim loại R (chưa biết hoá trị ) tác dụng với khí clo dư, thu được 8,55 gam muối. Kim loại R là

Complete the conversations with should or shouldn't. A. Eva: I'm going to Peru on vacation. Where ________ I go? Simone: You __________ go to Arequipa. It's beautiful. And you ____________ miss Cuzco. It's amazing! B. Cory: I want to buy a CD. Where __________ I buy it? Ben: You __________ buy it at the mall. It's too expensive. You __________ buy it online. It's cheaper.

Exercise 1: Put the verbs in the brackets in the correct tense || Type 3 || 1. If I had known that you were in hospital, I (visit) _____ you. 2.You would have seen my garden at its best if you (be) _____ here last week. 3. I shouldn't have believed it if I (not see) _____ it with my own eyes. 4. If he had asked you, you _____(accept) ? 5. If I (know) _____that you were coming, I'd have baked a cake. 6. If I (had) _____a map, I would have been all right. 7. The hens (not get) _____. into the house if you had shut the door. 8. If he had known that the river was dangerous, he (not try) _____ to swim across it. 9. If you (speak)_____more slowly, he might have understood you. 10. If he had known the whole story , he (not be) _____so angry. 11. I (offer) _____ to help him if I had realized that he was ill. 12. If you had left that wasp alone, it (not sting) _____you. 13. If I (realize) _____what a bad driver you were, I wouldn't have come with you. 14. If I had realized that the traffic lights were red, I (stop) _____ 15. But for the fog, we (reach) _____ our destination ages ago.

rút gọn: a) 8^3. 3^12 / 4^5.9^6

Tính tổng dãy số sau:2+4+6+8+10+....+98

Tính tổng dãy số sau: 1+3+5+7+9+11+....+99

Vẽ hộ mình cây scar titan nhó ghi hộ mình chữ Chang>< Đẹp mình tích :3