`(3-x)^2+(2-x)(2+x)-(x+5)^2`
`=(x^2-6x+9)+(4-x^2)-(x^2+10x+25)`
`=x^2-6x+9-x^2+4-x^2-10x-25`
`=(x^2-x^2-x^2)+(-6x-10x)+(9+4-25)`
`=-x^2-16x-12`
Đáp án:
-(X-2)²- 8
Giải thích các bước giải:
(3-x) ²+(2-x) ×(2+x)-(x+5) ²
=9-6x+x²+4-x²-x²+10x-25
=4x-x²-12
=-(x-2)²-8
CHÚC BẠN HOK TỐT TICK MIK 5* NHA
3. _______ you carry this bag for me? A. May B. Should C. Will D. Shall 4. You _______ throw litter on the streets. A. mustn't B. couldn't D. needn't D. won't 5. My mother permitted me to go out at night. She said, "You _______ go out tonight". A. may B. have to C. must D. ought to 6. It is possible that she _______ come to our party tonight. A. need B. ought to C. should D. will 7. They can type. They _______ type. A. lean how to B. are able to C. know how to D. both B &C 8. He advised me to take an English course. I _______ take it early. A. should B. shall C. will D. may 9. I'd rather _______ in the field than _______ home. A. to work/ to stay B. work/ stay C. working/ staying D. worked/stayed 0. As an orphan, he _______ earn his living alone. A. have to B. have had to C. ought to D. had to 1. They prayed that their daughter _______ be lucky again. A. may B. will C. could D. might 2. She _______ all that money, so she could save some. A. didn't need to spend B. needn't have spent
Cho A = 12-|x+1|.Tìm GTLN của A biết x thuộc Z
Mọi người lm ơn giúp em bài này vs ạ ! 5h30 em phải nộp rồi ạ ! Em cảm ơn nhiều ! Hứa vote 5*+CTLH ạ !
làm ơn giúp mình với: choose the best answer 1. I would like a ____________ table A. beautiful wooden round B. round beautiful wooden C. beautiful round wooden D. wooden beautiful round 2. Thomas wore a ____________ shirt yesterday . A. new white lovely cotton B. lovely new white cotton C. lovely cotton new white D. new white cotton lovely 3. I have just bought an ____________ painting A. interesting old French B. interesting French old C. old French interesting D. old interesting French 4.He is living a ____________ house A. wooden small old B. wooden old small C. small old wooden D. small wooden old 5. She broke a ____________ jar A. beautiful old blue B. beautiful blue old C. blue beautiful old D. blue old beautiful 6.It's an expensive ____________ coat A. long fur grey B. grey long fur C. long grey fur D. grey fur long 7. A ____________university A. modern Australian new B. new modern Australian C. new Australian modern D. modern new Australian 8. A ____________ shoe A. small German running white B. small German white running C. small white German running D. small running white German 9. A ____________ student A. good university young B.good young university C. young good university D.university good young 10. It’s ____________________ . A. a large wooden nice chair B. a nice large wooden chair C. a wooden nice large chair D.a nice wooden large chair 16. He was a/an_________ . A. nice intelligent young man B. intelligent nice young man C. man of nice intelligent young D. intelligent young nice man 18. I watched an __________ movie on television last night. A. old American interesting B. American interesting old C. old interesting American D. interesting old American
5. Everybody has a great regard for her despite herpoverty. Although ....................................................................................................................................... 6. In spite of the cold weather, we all woreshorts. Even though .................................................................................................................................. 7. In spite of her beauty and intelligence, nobody likesher. Even though .................................................................................................................................. 8. In spite of her broken leg, she managed to get out of thecar. Even though .................................................................................................................................. 9. Despite the narrow streets, many people drive cars in thiscity. Though .......................................................................................................................................... 10. In spite of playing well, our team lost thegame.
Cân bằng FeS + HNO3 + H2O -> Fe(NO3)3 + Fe2(SO4)3 + NH4NO3
tìm x F)5.x+3.(10-x)+x=45 g)336+x+64+2.x=100
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Exercise 3: Wh-questions 1.He asked her, “Why are you crying?” ……………………………………………… 2.I asked the receptionist, “What time does the train leave?” 3.She asked him, “Why are you wearing sunglasses?” ……………………………………………… 4.“Who are you going to invite to the party?", Minh asked Thu. ……………………………………………… 5.“How can we get to the cinema?” Loan asked us. ………………………………………………
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