Giúp em giải bài tập này nha mọi người

giải phương trình 2-x/2016 - 1 = 1-x/2017 + x/2018

Biết rằng 3,5l dầu cân nặng 2,8kg. Hỏi có bao nhiêu lít dầu, nếu lượng dầu đó cân nặng 19,2kg

2(3x+1)=3(5-x) (x+5)(2x-1)=(2x-3)(x+1)

Làm hết giúp mink nha Chi tiết một chút Cảm ơn các bạn

M.n giúp e bài tem bưu chính vs ạ °~°

Giúp mình bài 5 ,6 ,7 nha 😇😇🤗🤗😢😢 Mình cần gấp ạ Mình sẽ vote 5* cho người trả lời đầy đủ và chính xác sẽ cho câu trả lời hay nhất

Có bốn mẫu khí A, B, C, D đựng riêng biệt trong các bình thủy tinh. Mỗi khí có một số tính chất trong các tính chất sau: A. Cháy trong không khí tạo ra chất lỏng không màu (ở nhiệt độ thường), chất lỏng này làm cho đồng(II) sunfat khan màu trắng chuyển thành màu xanh. B. Độc, cháy với ngọn lửa màu xanh, sinh ra chất khí làm đục nước vôi trong. C. Không cháy nhưng làm cho ngọn lửa cháy sáng chói hơn. D. Không cháy mà còn làm tắt ngọn lửa và làm quỳ tím ẩm hoá đỏ.

Giúp mình với ạ , mình đang cần gấp , trả lời nhanh mình đánh giá 5 sao nha @@ EXERCISE 1: Choose the correct sentence among A, B, C or D which has the same meaning as the given one. 1. Eight years ago we started writing to each other. A. We have rarely written to each other for eight years. B. Eight years is a long time for us to write to each other. C. We wrote to each other eight years ago. D. We have been writing to each other for eight years. 2. The boy was so lazy that he couldn't stay up late to learn his lessons. A. The boy was lazy enough not to stay up late to learn his lessons. B. The boy was too lazy to stay up late to learn his lessons. C. The boy was lazy enough but he stayed up late to learn his lessons. D. The boy was lazy enough to stay up late to learn his lessons. 3. My father is tired of seeing any violent films. A. My father hasn't seen a violent film. B. My father has enjoyed all the violent films he has ever seen. C. My father is worried about missing the next violent film. D. My father never wants to see another violent film. 4. As soon as he waved his hand, she turned away. A. He saw her turn away and he waved his hand. B. No sooner had he waved his hand than she turned away. C. She turned away because he waved his hand too early. D. Although she turned away, he waved his hand. 5. John wishes he had remembered to send Mary a Christmas card. A. John regrets not to send Mary a Christmas card. B. John regrets forgetting not to send Mary a Christmas card. C. John regrets not remembering sending Mary a Christmas card. D. John regrets forgetting to send Mary a Christmas card. 6. My father hasn't smoked cigarettes for a month. A. It's a month since my father last smoked cigarettes. B. It's a month ago that my father smoked cigarettes. C. It's a month that my father hasn't smoked cigarettes. D. It's a cigarette that my father smoked a month ago. 7. Having finished their work, the workers expected to be paid. A. The workers expected to be paid because they had finished their work. B. Having their work finishing, the workers expected to be paid. C. Having expected to be paid, the workers finished their work. D. Having been finished their work, the workers expected to be paid. 8. Mr. Brown bought this car five years ago. A. Mr. Brown started to buy this car for five years. B. It has been five years when Mr. Brown has bought this car. C. Mr. Brown has had this car for five years . D. It is five years ago since Mr. Brown has bought this car. 9. John used to write home once a week when he was abroad. A. John doesn't write home once a week any longer. B. John enjoyed being written home every week when he was abroad. C. John never forgot to write a weekly letter home when he was abroad. D. When he was abroad he remembered to write home every week. 10. I haven't enjoyed myself so much for years. A. It's years since I enjoyed myself so much. B. It's years since I have enjoyed myself so much. C. It was years since I had enjoyed myself so much. D. It has been years since I have enjoyed myself so much.

Dùng công thức cấu tạo viết phương trình hóa học của phản ứng giữa stiren với: a) H2O (xúc tác H2SO4) b) HBr c) H2 (theo tỉ lệ số mol 1:1, xúc tác Ni)