Đáp án:
Điều kiện:`(x^2-3x+8)/(x-3)>=0(x ne 3)`
Mà `x^2-3x+8`
`=(x-3/2)^2+23/4>=23/4>0`
`<=>x-3>0`
`<=>x>3.`
`pt<=>\sqrt{x^2-3x+8}=3sqrt{x-3}`
`<=>x^2-3x+8=9(x-3)`
`<=>x^2-12x+35=0`
`Delta'=36-35=1`
`<=>` \(\left[ \begin{array}{l}x_1=\dfrac{-b'+\sqrt{\Delta'}}{a}=7\\x_2=\dfrac{-b'-\sqrt{\Delta'}}{a}=5(tm)\end{array} \right.\)
Vậy `S={5,7}.`
`\quad \sqrt{(x^2-3x+8)/(x-3)}=3` ĐK: `x>3`
`<=> (x^2-3x+8)/(x-3)=9`
`<=> x^2-3x+8=9(x-3)`
`<=> x^2-3x+8=9x-27`
`<=> x^2-12x+35=0`
`<=> x^2-7x-5x+35=0`
`<=> x(x-7)-5(x-7)=0`
`<=> (x-7)(x-5)=0`
`<=>`\(\left[ \begin{array}{l}x=7(tm)\\x=5(tm)\end{array} \right.\)
Vậy `S={7;5}`
`a^3/(a^2+ab+b^2) + b^3/(b^2+bc+c^2) +c^3/(c^2+ac+a^2)=2019` tính `P=b^3/(a^2+ab+b^2) + c^3/(b^2+bc+c^2) +a^3/(c^2+ac+a^2)`
`3` `1/7:{[2-1` `3/5:(4/3-1,6)]-25%}`
Ai giúp mình với mình hứa sẽ vote 5 sao nếu ai có câu trả lời nhanh
Mng giúp mình nhé viết thành bài luôn nha
mn lm đầy đủ các bước giúp mik vs nhé cảm ơn
phân biệt giúp mình từ dread, scare, afraid, fear với ạ?Cho mình vs luôn ạ😅
Làm giúp em với !! Cảm ơn ạ !!!!
Bài 1: a)(1/9)2005.92005-962:242 b)4510.520/7515 c)5.415.99-4.320.89/5.29.619-7.229.278
giải phương trình `(x^x-x)/(x^2-x+1)-(x^2-x+2)/(x^2-x-2)=1`
Exercise 10: Give the correct form of the verbs in brackets 1. I'll call you when I (arrive) ................ at my hotel. 2. He (text) ................. you as soon as he's on the bus 3. Let's eat dinner when John (get) .................. here. 4. Julie (be) ................. late tomorrow evening, so I've booked a table at a restaurant for 10 pm 5. As soons as I (be) ............... able to, I'm going to get a new job. 6. Please wait here until the nurse (call) ................. you. 7. I (get) ................... up early tomorrow morning and finish the report then. 8. bẻo you (leave) ....................., please make sure you've locked the door. 9. She (let) .................. us know later, when she's ready to leave. 10. I must clean my kitchen before my mother (get) .................... here. 11. I (come) .................. to meet you at the station next weekend. 12. I (wait) ..................... until you're finished - then we can go. 13. John (study) ..................... until he knows all the answers. 14. She thinks that it (rain) ...................... next weekend. 15. What do you want to do after the class (finish) .......................? 16. I think that the Democrats (win) ..................... the next election. 17. Jenny will come here after she (finish) ................... work. 18. I (give) ................. up smoking. 19. She (send) ................ me an email befor she leaves the office today Exercise 11: Write sentences using prompts 1. Tuan/ not/ like/cook. 2. My brother/ like/ play/ table tennis. 3. Minh/ hate/ eat/ apples. 4. Ha/ dislike/ play/ the piano. 5. My parents/ really love/ garden. 6. You/ fancy/ dance? 7. I/ not/ fancy/ eat/ noddles. 8. My dad/ detest/ watch/ Korean films. 9. My mum. adore/ ride/ her bike to work. 10. I/enjoy/ talk/ to my friends in my free time.
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