Mọi người giúp mình giải bài này với ạ :3 VD1: Giải các phương trình sau: a) (5x + 2).(x – 7) = 0 b) (x 2 +1).(x 2 + 4x + 4) = 0 VD2: Giải các phương trình sau: a) x 2 + 5x + 6 = 0 b) (x – 1)(x 2 + 5x - 2) – (x 3 – 1) = 0

Bài 4. “Cồn 90o chuyên dùng để sát trùng ngoài da và làm chất dung môi trong y tế. Ngoài ra, với thành phần chính là etanol, cồn 90o còn được sử dụng trong nhiều trường hợp như: sát trùng dụng cụ, sát trùng da trước khi tiêm, sát trùng vết thương”. Cồn 90o có ý nghĩa gì? Bài 5. Cloramin B là chất gì mà sát trùng được? Bài 6. Vì sao khi cơm bị khê người ta thường cho vào nồi cơm một mẩu than củi?

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions. A: cloudy B: harmful C: unique D: slowly 17 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (17). My village is about 50 kilometers from the city center. It is a very (17)________place where people plant flowers and vegetables only. It is very famous for its pretty roses and picturesque scenes. The air is quite fresh, however, the smell of the roses make people (18)________ cool. In spring, my village looks (19)________ a carpet with plenty of colors. Tourists come to visit it so often. Nowadays, with electricity, it doesn’t take the villagers much time to water the roses. A: beauty B: beautifully C: beatify D: beautiful

Choose the best answer A, B, C or D to complete the sentence. Question10. In the Central Highlands, the biggest and tallest house in the village is the _______ house. A: commune B: community C: communication D: communal 15 Choose the sentence which has a similar meaning to the first one. Question 23. Despite the firefighters’efforts, the building burned down completely. A: The building would not have burned completely if the firefighters had tried harder. B: The fire entirely destroyed the building even though the firefighters tried to stop it. C: As a result of what the firefighters had done, the building was destroyed in the fire. D: The firefighters did not work hard enough, and so the building was entirely burned down.

3(2.2-0.3x)=2.6+(0.1x4) ai giải giúp mình ạ Cảm ơn

Ex 3. Sắp xếp các câu đối thoại sau thành đoạn hội thoại hợp lý. Sai Đúng What time do you go to bed? What do you do after school? I have my lunch. Yes, I play volleyball. I do my homework and then watch TV. Do you play sports in the afternoon? What do you do in the evening? I go to bed at ten o’clock.

Choose the sentence which has a similar meaning to the first one. Question 25. There is little hope that Craig will be able to find a job. A: Craig hopes that it will only take a little time for him to get work. B: It is not very likely that Craig’s search for employment will be successful. C: Craig has given up hope of finding employment. D: Craig hopes that he won’t have to find work for himself. 13 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (18). My village is about 50 kilometers from the city center. It is a very (17)________ place where people plant flowers and vegetables only. It is very famous for its pretty roses and picturesque scenes. The air is quite fresh, however, the smell of the roses make people (18)________cool. In spring, my village looks (19)________ a carpet with plenty of colors. Tourists come to visit it so often. Nowadays, with electricity, it doesn’t take the villagers much time to water the roses. A: feel B: feeling C: to feel D: felt

Làm giúp mình câu 4 mình cần gấp ạ

nhận xét và nêu cách vẽ dáng người, cho 1 số bức tranh vẽ dáng của pạn

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (19). My village is about 50 kilometers from the city center. It is a very (17)________ place where people plant flowers and vegetables only. It is very famous for its pretty roses and picturesque scenes. The air is quite fresh, however, the smell of the roses make people (18)________ cool. In spring, my village looks (19)________a carpet with plenty of colors. Tourists come to visit it so often. Nowadays, with electricity, it doesn’t take the villagers much time to water the roses. A: as B: like C: same D: alike 11 Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions. A: laugh B: enough C: paragraph D: although