Đáp án + giải thích các bước giải :
` A=x^2+2x.5+29` $\\$` A = x^2 + 2.x.5 + 5^2 + 4` $\\$` A = (x+5)^2 + 4` $\\$` Vì : (x+5)^2 ge 0 => (x+5)^2 + 4 ge 4` $\\$$MinA = 4$` \Leftrightarrow x + 5 = 0 \Leftrightarrow x = -5`
`A=x^2+2x.5+29`
`A=(x^2+2.x.5+25)+4`
`A=(x+5)^2+4≥4>0∀x`
Dấu `=` xảy ra ⇔`x+5=0`
⇔`x=-5`
Vậy $Min_{A}$`=4`⇔`x=-5`
Viết 1 đoạn văn ngắn miêu tả cây trong sân trường có câu chủ từ và từ ngữ chủ đề
-Quan sát Tập bản đồ trang 6. Dọc theo kinh tuyến 80ºĐ, từ vùng cực Bắc đến vùng Xích đạo ở châu Á có những đới cảnh quan nào? -Tên các đới cảnh quan chủ yếu ở khu vực khí hậu gió mùa. giải hộ mik vs m.n ơi ;-;
tại sao từ bước đầu thành bước 2 dc vậy
giúp mik vs mng,hứa cảm ơn and 5 sao,ctlhn cho ai xong trc ak^^
Giúp em với ạ em cảm ơn nhiều lắm ạ😞
I don't share your opinion about military service. A) I don't think as you do on military service. B) I am different from you in military service. C) I don't agree with you about military service. D) what I think about military service is not like yours. giúp mik đi giải thích chi tiết vs ạ
1. We will go out when it (stop) ________ raining. 2. She (read) ______all the books written by Dickens. How many books _______ you (read) _______? 3. Alice and Mary (put) -------------- the dishes away right now. 4. What ________you (do) _________ at 10 am yesterday? 5. She (finish) ____________ her homework recently. 6. He (just see) ______________ her. 7. They (already show) _______________ the film. 8. I’m sorry the car is not here. I (just sell) ______________ it. 9. When _________you (buy) ________ your bicycle? 10. Mr. Green (buy) ______________ a new tractor last month. 11. They (live) ________________ in this street for a long time. 12. My brother (play) _______________ football at the moment. 13. Mr. Green (teach) ______________ French since he left London in 1997. 14. She often (go) _____________ to school by bicycle but yesterday she (go) __________by bus. 15. Look! It (snow) _______________. 16. She (not speak) _________________ to me since last week. 17. Up to now, Hoa (work) _______________ very hard. 18. HCM city (be) ______________ the largest city in Vietnam. 19. They (hold) ________________ the meeting recently. 20. Phong (sleep) _______________ right now 21. He (live) ________________ in Hanoi since 2002. 22. Long ago, my young brother often (cry) _______________ at night. 23. ________you (see) _________ him recently? 24. He (finish) ______________ his work since yesterday. 25. Peter and Daisy (be) __________ born in 1978. 26. Your dress is too long. It needs (shorten)……………………………... 27. Her uncle recommends her (apply)…………………………………… for that job. 28. Does the teacher allows (hand)………………………………… in our homework late? 29. He’ll try (not, make) …………………………………the same mistake again. 30. Did you remember (phone) …………………………………… Ann? – oh, i forgot it. 31. When you see tom, remember (give) ………………………………… him my regards. 32. I really regret (hurt) ……………………………… your feeling when i asked you that question. 33. It’s no use (advise)…………………………him. He never allows anybody (give) ……………advice. 34. My watch keeps (stop)…………………………………. 35. Tom refused (give)…………………………………… me his address. 36. Are his ideas worth (listen) ……………………………………to? 37. I’d love (have)…………………………………… a coat like that. 38. Every hour i stop (work)…………………………… (have)……………………………… a little rest. 39. You should try (wear)………………………………………… any shirts you want to buy. 40. I intend (tell)…………………………………… her what i think.
Chứng minh bài Sông núi nước nam là bản tuyên ngôn độc lập đầu tiên qua 1 đoạn văn ngắn. Jup mik với nha... ^ ^
Vẽ hai đường thẳng cắt nhau sao cho trong các góc tao thành có một góc 47 độ. Tính số đo các góc còn laỊ
giúp mìnhhhhhhhhhhhhhhhhhhhh vớiiiiiiiiiii
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