`(x+1)(x+2)=(2-x)(x+2)`
`⇔ (x+1)(x+2) - (2-x)(x+2)=0`
`⇔ (x+2)(x+1-2+x)=0`
`⇔(x+2)(2x-1)=0`
TH1: `x+2=0`
`=>x=-2`
TH2: `2x-1=0`
`=> x=1/2`
Vậy phương trình có `n_o = { -2 ; 1/2 }`
$(x+1)(x+2)=(2-x)(x+2)$
$↔(x+1)(x+2)-(2-x)(x+2)=0$
$↔(x+2)(x+1-2+x)=0$
$↔(x+2)(2x-1)=0$\(\leftrightarrow\left[ \begin{array}{l}x+2=0\\2x-1=0\end{array} \right.\) \(\leftrightarrow\left[ \begin{array}{l}x=-2\\x=\dfrac{1}{2}\end{array} \right.\)
Fill in the gaps with the right forms of the verbs in brackets to complete the following English sentences in Present Tenses: Simple, Continuous or Perfect. 44. In Spain women usually ________________ hats. (not wear) 45. Who ________________ that terrible noise? It is John. He ________________ his nose. (make, blow) 46. My dentist always keeps ________________ me to clean my teeth. I hate that. (tell) 47. He never ________________ to the theatre. (go) 48. I ________________ this weekend in Eastbourne. I ________________ there nearly every week. (spend, go) 49. My wife always keeps ________________ for more money at the end of the week. (ask) 50. Who ________________ to on the phone? (you speak) 51. I ________________ (not/do) the housework yet. 52. They ________________ (study) very hard recently. 53. She ________________ (promise) to help many times. 54. He ________________ (clean) the kitchen. Everything is sparkling clean. 55. She ________________ (write) her essay and ________________ (send) it to her professor. giải hộ mik nha
Tại sao khi chạy lâu, ta thường bị mỏi chân(đau cơ chân)?
Fill in the gaps with the right forms of the verbs in brackets to complete the following English sentences in Present Tenses: Simple, Continuous or Perfect. 29. My little sister ________________ the dishes on Saturdays and Sundays. (dry) 30. We ________________ a week in Italy each year. (spend) 31. Sarah is so lazy. She never ________________ to help her mum. (try) 32. You ________________ again. (cry) What's the problem? 33. He ________________ the soap because he likes the smell of roses. (SMELL) 34. That food ________________ delicious (TASTE). 35. How much ________________ ? (THOSE APPLES, WEIGH) 36. I ________________ they will be late. They probably got stuck in the traffic. (EXPECT) 37. That dress ________________ you perfectly. You ________________ great. (FIT, LOOK) 38. I'm in Paris because I ________________ French at a language school (STUDY). 39. At the moment Cynthia ________________ on the floor with her doll (LIE) 40. I usually ________________ as a secretary (WORK) 41. You can’t see Tom now. He ________________ a bath. (have) 42. He usually ________________ coffee, but today he ________________ tea. (drink, drink) 43. I won’t go out now because it ________________ and I ________________ an umbrella. (rain, not have) giải hộ mik nha các bạn
Cảm ơn mấy bạn đã giải giùm nha =))
Fill in the gaps with the right forms of the verbs in brackets to complete the following English sentences in Present Tenses: Simple, Continuous or Perfect. 1. I can't hear you! I ________________ a shower. (have) 2. Sam ________________ his homework at night. (do) 3. Look at the boy. He ________________ us. (watch) 4. She ________________ (work) here for five years. 5. I ________________ (study) all day. 6. You ________________ (eat) a lot recently. 7. We ________________ (live) in London for six months. 8. He ________________ (play) football, so he's tired. 9. They ________________ (learn) English for two years. 10. I ________________ (cook) so I'm really hot. 11. She ________________ (go) to the cinema every weekend for years. 12. It ________________ (rain) the pavement is wet. 13. You ________________ (sleep) for twelve hours. 14. I ________________ (not/work) today. 15. You ________________ (not/eat) well recently. 16. We ________________ (not/exercise) enough. 17. She ________________ (not/study). 18. They ________________ (not/live) here for very long. 19. It ________________ (not/snow). 20. He ________________ (not/play) football for five years. 21. We ________________ (not/drink) enough water - that's why we feel tired. 22. I ________________ (not/sleep) I was reading. 23. They ________________ (not/watch) TV much recently. 24. Our team is in Madrid this week. They ________________ part in a contest. (take) 25. I ________________ up very early on weekdays. (get) 26. My dad is in the garage. He ________________ his car. (clean) 27. Dan ________________ a lot of friends. (have) 28. I can see that you ________________ a lot of fun. (have) mấy bạn làm hộ mik nha
cơ năng của một vật là bao nhiêu nếu Wt=1/4 Wđ=35J
Giúp em câu 18 ạ E cảm ơn nhiều ạ
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