Đáp án + Giải thích các bước giải:
Gọi `C%` của dung dịch `Y` là `a`.
Ta có : `m_A/m_B = 3/7 = (|a-20|)/(|50-a|)`
`-> 7(a-20) = 3(50-a)`
`-> 7a - 140 = 150 - 3a`
`-> 10a = 290`
`-> a = 29`
Vậy `C%` của dung dịch `Y` là `29%`
1. ‘Why are you going to Hanoi tomorrow?’ the man asked me. The man asked _______________________________________________________________________ 2. ‘Don’t talk too loudly when my baby is sleeping,’ she said to us. She asked ___________________________________________________________________________ 3. ‘Where did you get this picture yesterday?’ Mary said to them. Mary asked __________________________________________________________________________ 4. ‘What has Alvin sent you since last week?’ she asked John. She asked ___________________________________________________________________________ 5. ‘Get out of here before I get angry with you,’ he whispered to the young man. He told______________________________________________________________________________ 6. ‘Peter wants to hang out with me today,’ Mary told us. Mary said ___________________________________________________________________________ 7. ‘Why don’t we eat lunch near this beautiful lake?’ asked Peter. Peter suggested _______________________________________________________________________ 8. ‘You should buy laptops here because they are very cheap,’ the office manager told him. The office manager advised _____________________________________________________________ 9. ‘You should not give this guy any more money, Elizabeth’, said John. John advised Elizabeth _________________________________________________________________ 10. ‘When was your boy born?’ said the nurse to Janet. The nurse asked Janet __________________________________________________________________ 11. ‘You will be able to find a better job,’ Tim said to me. Tim told_____________________________________________________________________________ 12. ‘We have seen this movie three times,’ George told Mary. George said __________________________________________________________________________ 13. ‘How long have you been doing this job?’ my friend asked me. My friend asked ______________________________________________________________________ 14. ‘I think everyone has to be responsible for what they have done,’ our grandpa said. Our grandpa said______________________________________________________________________ 15. ‘You should go and play with your toys if I am busy,’ said the father to his young girl. The father told _______________________________________________________________________ Giúp mình bài này nhe mọi người
Làm giúp tớ bài này nữa ạ, mình chân thành cảm ơnnn ạ🙏🙏🙏
Hãy Viết 1 Đoạn Văn 15-18 Câu Giới Thiệu Về Lễ Hội Bạch Đằng
Thể tích của vật thế nào khi nung một vật rắn
(LÀM VÀ GIẢI THÍCH GIÚP MÌNH.cố gắng giúp mình trc 8h nha) 23 thousands of steel___ were used as the framework of the new offical block. A beams. B girders. C stakes. D piles 24 the celling fans were on but unfortunately they only____ the hot humid air A stirred up. B poured through. C turned into. D cut back 34 what on earth is going_____ in there? A round. B down. C up. D on
5. David’s leaving on Friday, I suggest we all … and get him a going-away present. $1 each should do A dish out B chip in C pass the bucket D pay on the nail 6. Many people who are paid below legal minimum are frightened to complain in case they are … as trouble-makers A slandered B branded C called D imprinted 7. I don’t like turning down work, but I’ll have to, I’m afraid. I’ve got far too much … at the moment A up my sleeve B on my plate C on my mind D in effect 8. He has had a … on his shoulder ever since he didn't get the promotion he was expecting. A weight B chip C knock D dent 9. We should give Robert a rise. He’s very efficient and never puts a … wrong A leg B foot C step D hand 10. “If you implement this scheme, we shall have no choice but to go on strike” – “…….., we must implement the scheme” A be that as it may B may that be as it is C though it be thus D while that be so 11. Yehudl said he found learning languages as easy as …. He had a gift for it. A sliding off a branch B falling off a log C diving off a climb D branching off a bough 12. George wouldn’t admit he was in love with Linda, but the sparkle in his eye spoke … for the fact.
11. We wish you ……………. yesterday. (arrive) 12. I wish I ……………. the answers. (not lose) 13. You wish you ……………. what to do last year. (know) 14. I wish that he ……………. us next year. (visit) 15. She wishes that she ……………. at home now. (be) 16. I wish I ……………. the news. (hear) 17. You wish that he ……………. you last week. (help) 18. I wish I ……………. the subject more interesting. (find) 19. He always wishes he ……………. rich. (be) 20. The boy wishes that he ……………. the competition the next day. (win)
Bài tập áp dụng 1. A. naked B. looked C. crooked D. wicked 2. A. concerned B. raised C. developed D. maintained 3. A. laughed B. photographed C. coughed D. weighed 4. A. looked B. naked C. cooked D.booked 5. A. communicates B. mistakes C. loves D. hopes 6. A. manages B. laughs C. photographs D. makes 7. A. traveled B. learned C. landed D. fastened 8. A. beloved B. learned C. used D.ragged 9. A. unmatched B. learned C. beloved D. sacred 10. A. naked B. beloved C. learned D.ragged
Hãy Viết 1 Đoạn Văn 15-18 Câu Giới Thiệu Lễ Hội Yên Tử
1. I haven’t realized what it means yet (sunk) => 2. The disagreement is a lot of fuss about nothing (teacup) => 3. Organic vegetables are said to be very healthy (wonders) => 4. They are waiting for him to arrive at any minute (due) =>
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