Đáp án + giải thích bước giải :
`|x + 1| - |x - 1| = 0`
Ápn dụng `BĐT |x| - |y| ≤ |x - y|` có :
`|x + 1| - |x - 1| ≤ |x + 1 - x + 1| = |2| = 2`
Dấu "`=`" xảy ra khi :
`(x - 1) (x + 1 - x + 1) ≥ 2`
`↔ x ≥ 1`
Vậy $GTLN$ của `|x + 1| - |x - 1| = 0` là `2` tại `x ≥ 1`
I x + 1 I- I x -1 I = 0TH1: x + 1=0 ; TH2: x -1 = 0⇒ x =0-1 ⇒ x =0+1⇒ x =-1 ⇒ x =1 Vậy: x={-1;1}
Hãy tả lại cảnh quê hương em vào một buổi sáng đẹp trời. --- GIÚP MÌNH VỚI😁😁😁😁 ---
Giúp ạaaaaaAaaaaaaaaaaaaaaaaaaaa
Vẽ semi nha mn xấu = bc nl ai nói chuyện đi
Phương pháp tối ưu nhata để thu khí oxi sau khi điều chế trong phòng thí nghiệm là ?
Vẽ mầm nha mn nl cóa ai9 nói chuyện hông chán quá
1. Be quiet! The baby (sleep) ... 2. The sun (set) ... in the West 3. Mr Green always (go) ... to work by bus. 4. It (not rain) ... in the dry season. 5. They (have) ... lunch in the cafeteria now. 6. She ... (go) camping tomorrow. 7. The doctor sometimes (return) ... home late. 8. He (write) ... a long novel at present. 9. Look! The bus (come) ... 10. The earth (move) ... around the sun. 11. What you (do) ... at 8 p.m yesterday. 12. His uncle (teach) ... English in our shool five years ago. 13. The old man (fall) ... as he (get) ... info the bus. 14. When I saw him, he (sit) ... asleep in a chair. 15. She ... (visit) her aunt next week. 16. Last Monday, while I (read) ... a book, the phone rang. 17. They (not speak) ... to each other since they quarreled. 18. I (try) to learn English for years, but I (not succeed) ... yet. 19. I (not see) ... her seen last week. 20. John (do) ... his homework already. (Đây là đề cương dành cho học sinh giỏi, bên nào làm được thì làm nha)
Các bạn giúp mình tạo một ảnh bìa cho kênh Lynn _ Rin đc ko ạ
use a simple past or past perfect tense form 1 (they/go)home when you (arrive)? 2 Simon (get) lost because he( not take) map with him. complete the sentences with the correct form of the verbs in past tenses 1 While he (write ) a letter ,the telephone (ring). 2 When i (stand) at the bus stop , i (see) an accident . 3 After the guests (leave) ,she (go) back into the living room and (switch)off the light. 4 on arrival at home i (find) that she ( just leave) just a few minutes before. 5 before he (go) to bed ,he (do )his homework. 6 After they (go) ,i (sit) down and (rest). 7 When i (arrive), the dinner ( already,begin). 8 my friend (not see) me for many years when i (meet) last week . 9 he (learn) english before he (leave ) for england. 10 In england ,he soon (remember) all he (learn) before. 11 they (tell) him they (not meet) him before. 12 By the time Bill (get) there ,the meeting (start). 13 When we (arrive) at our place , we(find) that a burglar (break) in. 14 She (say) that she (already,see) Dr.Rice. 15 Almost everybody (leave) for home by the time we (arrive).
Giúp mình với các bạn ơi, mình sẽ bình chọn CTLHN
Tìm giá trị lớn nhất khi biết I x + 1 I- I x -1 I = 0
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
