Giải hệ phương trình: $\left \{ {{x^3y\sqrt{x}+x^3y^2=2x^4\sqrt{x}+2x^4y} \atop {y\sqrt{x}(\sqrt{2x^2-6}-1)=\sqrt{5x(2x^2-6)}}} \right.$

Bài tập khoanh Exercise 3: Mark the letter A, B, C, orD to indicate the correct answer to each of the following questions. 1. Before she left for Australia she promised her parents that she would drop them at least once a month. A. a note B. a word C. the news D. a line 2. I was all set to take the job in Tokyo, but at the last minute I and decided to stay in Britain. A. pulled my finger out B. got cold feet C. held my horses D. called it a day 3. “What I’ve got to say to you now is strictly publication,” said the government official to the reporter. and most certainly not for A. beside the point B. for the time being C. by the way D. off the record 4. I’ve never enjoyed going to the ballet or the opera; they’re not really my . A. piece of cake B. chip off the old block C. biscuit D. cup of tea 5. “What’s wrong with Tom today? He’s unusually quiet.” “He’s got something on his . I expect.” A. brain B. mind C. thoughts D. brow 6. He was wearing very shabby, dirty clothes and looked very . A. easy-going B. down to earth C. out of shape D. down at heel 7. Since he started his own business he has been making money hand over . A. fist B. heel C. head D. palm 8. I can’t see us beating them at tennis this year - we’re so out of . A. step B. practice C. fitness D. breath 9. I’m not surprised that Tom is ill. He’s been to affect his health sooner or later. for a long time. It was bound A. having his cake and eating it B. burning the candle at both ends C. playing with fire D. going to town 10. I just couldn’t remember her name even though it was on the of my tongue. A. edge B. tip C. top D. front Exercise 4: Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions. 1. That’s exactly what I mean, Tom. You've ! A. put your foot in it B. killed two birds with one stone C. put two and two together D. hit the nail on the head 2. “I’m going for an interview for a job this afternoon.” “Good luck! I’ll keep my crossed for you.” A. legs B. fingers C. arms D. hands 3. “If only I hadn’t lent him all that money!” '‘Well, you did, so it’s no good crying over milk.” A. spilt B. wasted C. sour D. goat’s 4. The car swerved to avoid a cyclist and just missed hitting a passer-by.by . A. a slight edge B. a narrow escape C. a close thing D. a hair’s breath 5. Well, well, if it isn’t Kathy Lewis! You’re a sight for _____eyes! A. old B. blue C. sore D. crocodile 6. I know times have been bad lately, Peter, but keep your up; things are bound to get better soon. A. chin B. head C. socks D. mind 7. He may be shy now, but he’ll soon come out of his when he meets the right girl. A. shoe B. shell C. shed D. hole 8. I’m afraid you’ve caught me on the afternoon. _____. I wasn’t expecting you until this A. stove B. grapevine C. spot D. hop 9. Nagging Susan to stop smoking has no effect on her. It’s like water off _____ A. a windmill B. a duck’s back C. a dripping tap D. an umbrella 10. Have you seen the new boss? She’s the image of Marilyn Monroe. live B. true C. spitting D. same

Mik ko tìm thấy môn khoa học nên để tạm nhé. Cho 4 nguyên liệu: muối gạo dầu ăn nước Tạo ra 2 thí nghiệm và cho biết đâu là dung dịch và đâu là hỗn hợp. Các bạn có thể sử dụng 1 nguyên liệu 2 lần nhóa. Nhanh cái trước lúc 9h30p nha. tăng điểm rùi đóa

giúp mình làm đúng chi tiết nhé! 10h mình phải nộp bài rùi! hứa vote5*

tách riêng từng kim loại từ hỗn hợp 3 chất rắn mgco3,k2co3,baco3

`x^2 + 2x + 1 = (x)^2 + 2.(x).(1) + (1)^2 = (x+1)^2` Giải thích tại sao : ` (x)^2 + 2.(x).(1) + (1)^2 = (x+1)^2`

mn chỉ em 2 câu này với ạ có giải thích nha

Tìm lỗi sai trong câu Nếu đúng thì điền C Do you know the person from whom he bought his car? PS nếu đúng thì trl đúng và giải thích, sai thì chỉ cần sửa, ko cần dài dòng

1. My hair is awful / wonderful, I must go to the hairdresser's. 2. The weather is terrible / nice, I don't want to go out. 3. The traffic is horrible / good in the center. Take the train. 4. That's a bad / wonderful idea! Let's do it! 5. My timetable is not great / bad. I'm free on Wednesday and Friday.

Giúp mik vs mn ơi nhanh giùm mik nha