Tìm các số tự nhiên x và y biết :2^x+3=y^2

Cho 9,6 gam bột kim loại N (hóa trị không đổi) vào 250 ml dung dịch gồm Fe(NO3)2 0,6M và Cu(NO3)2 0,2M rổi khuấy cho đến khi các phản ứng xảy ra hoàn toàn, thu được dung dịch X và 16,4 gam chất rắn Y. a)Xác định kim loại N. b)Tính nồng dộ mol/l của chất tan trong X, coi V dung dịch không thay đổi trong toàn quá trình.

Vẽ hai con vịt vàng ở dưới tranh ghi chữ mk là vit vàng đây

50dd chỉ cần làm câu d ạ vote 5 sao và ctlhn

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Cho a,b thỏa mãn $\left \{ {{a³+2.b²-4b+3=0} \atop {a²+a².b²-2b=0}} \right.$ Tính giá trị B= $a^{2020}$ +$b^{2021}$ +2022

Cho 2 xâu S1,S2 được nhập vào từ bàn phím.Nếu 2 xâu có kí tự giống nhau, viết 1, nếu ko viết 0 mik cần gấp :((

Giúp mik nhé, mik đag cần gấp Chu vi của một hình chữ nhật bằng 160m. Tính diện tích hình chữ nhật biết chiều dài bằng 3/2 chiều rộng

Hãy viết một bài văn nói về ấn tượng đầu tiên của em về trường THCS

1. He can't go out because he has to study for his exam.  If ................................................................................................................................................................ 2. She is lazy so she can't pass the exam.  If ................................................................................................................................................................. 3. He smokes too much; that's why he can't get rid of his cough.  If ................................................................................................................................................................ 4. I can't play football this afternoon because I felt tired.  If ................................................................................................................................................................. 5. Olga and Ivan weren't paying attention, so they didn't see the sign marking their exit from the highway.  If ................................................................................................................................................................. 6. She can't be employed because she doesn't have a college degree.  If ................................................................................................................................................................. 7. She walked to the meeting. She was late.  If ................................................................................................................................................................ 8. Unless you promise to return back, I won't lend you.  If ................................................................................................................................................................ 9. We put off our trip because the weather was terrible.  If ................................................................................................................................................................ 10. Sally doesn't know what she has to do for homework because she was absent from school on Friday.  If ................................................................................................................................................................. 11. If you do not like this one, I'll bring you another.  Unless ......................................................................................................................................................... 12. Martin failed his driving test last week because he was very nervous.  But for......................................................................................................................................................... 13. He will pay me tonight; I will have enough money to buy a car.  If ................................................................................................................................................................ 14. Leave me alone or I'll call the police.  If ................................................................................................................................................................ 15. If you arrive at the office earlier than I do, please turn on the air-conditioner.  Should......................................................................................................................................................... 16. He died so young; otherwise, he would be a famous musician by now.  Had it .......................................................................................................................................................... 17. The car breaks down so often because you don't take good care of it.  Were you ................................................................................................................................................... 18. Don’t tell lies to your boss or you'll be fired at once.  If ................................................................................................................................................................. 19. He didn't revise all his lessons, so he failed the exam.  Had ........................................................................................................................................................... 20. Rita is exhausted today because she didn't get any sleep last night.  If .................................................................................................................................................................