Đáp án:
nH= 2nH2O chứ bạn
Áp dụng ĐLBTNT bạn nhé
Giải thích các bước giải:
`n_H = 2.n_{H_2O}`
`CT : n_{1 nguyên tố trong một hợp chất}=n_{hợp chất} . chỉ số`
#Chúc bạn học tốt!
Viết đoạn văn chủ đề tùy chọn nhưng khoa học có sử dụng các thành phần tình thái chỉ rõ nha
Nêu cách di chuyển của lớp bò sát ngắn gọn ko dài dòng ko coppy ok
V.Fill in the gap with a correct verb in the box. looks–plant-thought- has -bought-planted- learn – watched Tung (1) __________his neighbor, Mr. Thuan (2)__________ trees in his garden. He (3)_________ planting trees was a good hobby. He decided to (4)__________ how to plant trees. He (5)__________ some small trees and (6)__________ them in front of his house. They had lots of green leaves and some little flowers. Now, he (7)__________ a small garden and it (8)__________ verypretty.
12 Mark the letter A, B, C, D on your answer sheet to indicate a meaningful sentence from the words and phrases given A chemical factory /our town/ polluted/ the river/ lately/? A. A chemical factory in our town have polluted the river lately, haven’t it? B. A chemical factory in our town has polluted the river lately, didn’t it? C. A chemical factory in our town has polluted the river lately, hasn’t it? D. A chemical factory in our town polluted the river lately, hasn’t it? 13 Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. In the city, more teenager (A) have committed (B) illegal activities (C) these days (D). A. teenager B. have commited C. activities D. days 14 Mark the letter A, B, C, D on your answer sheet to indicate a meaningful sentence from the words and phrases given We/ believe/ urban transport pods/ travel/ around 30 kph. A. We believe that urban transport pods can travel at around 30 kph. B. We believe that urban transport pods can travel around 30 kph. C. We believe that urban transport pods will be travel at around 30 kph. D. We are believing that urban transport pods can travel at around 30 kph. 15 Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. Will we travelling (A) in driverless (B) and high-speed (C) cars in the next (D) ten years? A. Will we travelling B. driverless C. high-speed D. The next 16 Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. This time (A) next week, we will take (B) a test on (C) sources of (D) energy. A. take B. This time C. on D. of 17 Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. We should help the elderly and orphans because they need our hands. A. want B. need C. ought to D. might 18 Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. If we are able to collect solar energy, we will be sure to have this abundant source of power. A. limited B. necessary C. natural D. plentiful 19 Mark the letter A, B, C or D on your answer sheet to indicate the best sentence that can be made from the word cues given. Solar energy / used / in the world / many countries. A. Solar energy will be used in the world by many countries. B. Solar energy are used in the world in many countries. C. Solar energy are used in the world by many countries. D. Solar energy will be used in the world on many countries. 20 Mark the letter A, B, C or D on your answer sheet to indicate the best sentence that can be made from the word cues given. At this time next week/ students/ play/ soccer/ playground. A. At this time next week, the students will be playing soccer in the playground. B. At this time next week, the students will playing soccer in the playground. C. At this time next week, the students will play soccer in the playground. D. At this time next week, the students will be played soccer in the playground.
Mọi người ơi làm ơn giúp em vs ! Em cần gấp lắm ạ ! Tí nữa em phải nộp cô rồi ạ ! Em cảm ơn
giúp mình bài tiếng anh này với ạ mình cảm ơn
Viết đoạn văn cảm nhận cảnh vượt thác của Dượng Hương Thư
Giúp mk bài này nha mọi người mai mk phải nộp bài rồi :))
1. My mother cleans the rooms every day. => The room ______________________________________________________________ 2. They grow coffee in Kenya. => Coffee ________________________________________________________________ 3. People speak English all over the world. => English ________________________________________________________________ 4. Somebody brings milk to her house every morning. => Milk __________________________________________________________________ 5. My father takes me to Dam Sen Park every month. => I _____________________________________________________________________ 6. They collect glass and send it to the factory. => Glass __________________________________________________________________ 7. They don’t eat chicken during two months. => Chicken ________________________________________________________________
cho hàm số y=f(x)=2x^2+4 .tinh f(2) f(1)
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