x + 678 = 2813 4529 + x = 7685 x - 358 = 4768 2495 - x = 698 x × 23 = 3082 36 × x = 27612 x : 42 = 938 4080 : x = 24 Bài 2: Tìm x a. x + 6734 = 3478 + 5782 b. 2054 + x = 4725 - 279 c. x - 3254 = 237 x 145 d. 124 - x = 44658 : 54 Bài 3: Tìm x a. x × 24 = 3027 + 2589 b. 42 × x = 24024 - 8274 c. x : 54 = 246 ×185 d. 134260 : x = 13230 : 54

3. Có 3 lọ đựng hh Fe+FeO, Fe+Fe2O3, FeO +Fe2O3. Hãy nhận biết hỗn hợp các chất trong các lọ trên. 4. Bằng phương pháp hóa học, nhận biết các chất khí có trong cùng một hỗn hợp gồm: CO, CO2, SO3, SO2, H2.

Cho 100 ml hh 2 axit HCl 1,2M và H2SO4 0,8M. thêm vào đó 10g bột Fe, Mg, Zn. Sau khi các p/ứng xong lấy 1/2 lượng H2 sinh ra cho qua ống nghiệm đựng a gam CuO nung nóng, phản ứng hoàn toàn thu đc 14,08g chất rắn. tính a

vẽ đậu mầm đang buồn , khóc , tương tư , say và thất tình Nếu vẽ thêm chibi mik cs thể cho tlhn mik cám ơn trc

viết đoạn văn nghị luận về cuộc sống có ý nghĩa dưới dạng dàn ý thì tốt

2. Bằng phương pháp lí, hóa, nhận bết 4 ống nghiệm mất nhãn chứa 4 dd NH3, NaOH, FeCl2, FeCl3

1. Question 1. Be quiet! I _______ a book. read am reading 2. Question 2. You _________ the dishes. (never do) never do are never doing 3. Question 3. What film _______? (watch) do you watch? are you watching? 4. Question 4. Mum, Tom ______ (pick) his nose again! picks is picking 5. Question 5. He ______ to school every day. (walk) walks is walking 6. Question 6. I ______ London. (love) love am loving 7. Question 7. I ______ there whenever I can. (go) go am going 8. Question 8. I always ________ there by plane. (go) go am going 9. Question 9. Right now, we _______ to a lovely cd. (listen) listen are listening 10. Question 10. My brother _______ his driving exam now. (take) takes is taking gạch chân từ nhận biết thì

56. They think the owner of the house is abroad. => The owner……………………………………………………………….................................. 57.The mechanic serviced my car last week. => I……………………………………………………………………………............................. 58.They haven’t cleaned the streets this week. => The streets…………………………………………………………......................................... 59.The police has just released John. => John…………………………………………………………………………………………… 60.The leak was repaired by the plumber this morning. => The plumber ………………………………………………………………………………… 61.Somebody stole his watch yesterday. => His watch ………………………………………………………………................................. 62.They’ll have to change the date of the meeting again. =>The date…………………………………………………………………………………….... 63.The garage is going to repair the car for us next week. =>We are going ……………………………………………………………………………….... 64.The postman was bitten by our dog. =>Our dog……………………………………………………………………………………….. 65.They will catch all the prisoners again by tonight. => All the prisoners………………………………………………………………………………. 66.Afire destroyed most of the old city of London in the 1600s. - The destruction………………………………………………………………………………….. 67.Peter spent a lot of money on video games. - A lot of money…………………………………………………………………………………. 68.People say that protecting national sovereignty is the most important mission. - It is ……………………………………………………………………………………………... - Protecting national sovereignty ……………………………………………………………….. 69. They spent a lot of money on food and clothes. - A lot of money………………………………………………………………………………… 70. Somebody has already fixed the computer. - The computer…………………………………………………………………………………… 71. They spent half an hour washing the car this afternoon. - This afternoon, it………………………………………………………………………………

Đề bài : Hai số chẵn có tổng bằng 210 và giữa chúng có 18 số chẵn Tìm 2 số đó.

Giải thích cho mình bài này với