Đáp án+Giải thích các bước giải:
a)M`=(a+b) ³ + (a-b) ³ -6a ²b`
`=a³+3a²b+3ab²+b³+a³-3a²b+3ab²+b³-6a²b`
`=2a³-6a²b -6ab²+2b³`
`M=(a+b)^3+(a-b)^3-6a^2b`
`M=a^3+3a^2b+3ab^2+b^3+a^3-3a^2b+3ab^2-b^3-6a^2b`
`M=(a^3+a^3)+(3a^2b-3a^2b-6a^2b)+(3ab^2+3ab^2)+(b^3-b^3)`
`M=2a^3-6a^2b+6ab^2`
1. Could you tell me your surname? * A. Would you like me to spell it? B. Do you like my family name? C. How do I say that? 2. This plant looks dead. * A. It's in the garden. B. It only needs some water. C. It's sleeping. 3. I hope it doesn't rain. * A. Of course not. B. Will it be wet? C. So do I. 4. Are you going to come inside soon? * A. For ever. B. Not long. C. In a minute. 5. Who gave you this book, Lucy? * A. I bought it. B. For my birthday. C. My uncle was. 6. Shall we go out for pizza tonight? * A. I know that. B. It's very good. C. I'm too tired. 7. Do you mind if I come too? * A. That's fine! B. I'd like to. C. I don't know if I can. 8. There's someone at the door. * A. Can I help you? B. Well, go and answer it then. C. He's busy at the moment. 9. How much butter do I need for this cake? * A. I'd like one. B. I'll use some. C. I'm not sure. 10. How long are you here for? * A. Since last week. B. Ten days ago. C. Till tomorrow. 11. Have you guys had enough to eat? * A. That's all right. B. Is there any more rice? C. It's not the right time. 12. That's my coat over there. * A. Will you take it off? B. No, you haven't! C. Here you are. 13. Let's go by bus. * A. The train was expensive. B. We'll buy a ticket. C. It'll take too long. 14. Do you know my brother Charlie? * A. Sorry, he's not here. B. I don't think I do. C. I know. 15. Would you like some ice in your drink or not? * A. I hope so. B. Yes, I shall. C. I don't mind. 16. I hope I haven't ...... you any trouble by changing the arrangements. * A. put B. caused C. made D. done 17. The floor is wet: don't run or you might ...... ! * A. stoop B. spill C. slip D. spin 18. When you come to my house, ...... your camera with you. * A. take B. show C. fetch D. bring 19. Paul arrived at the shop ....... as the manager was closing for the day. * A. even B. just C. still D. right 20. I would ...... to stay at home and relax for a change. * A. rather B. better C. prefer D. enjoy 21. Is there ...... of food for everyone? * A. adequate B. enough C. sufficient D. plenty 22. Lily says she's happy at school but she's ...... complaining. * A. rarely B. sometimes C. always D. often 23. ...... the step when you go in. * A. Consider B. Mind C. Attend D. Look 24. ...... stay the night if it's too difficult to get home. * A. At all costs B. By all means C. In all D. On the whole 25. No ...... Hannah is happy when you think how many prizes she has won recently. * A. surprise B. problem C. question D. wonder
IV. Complete the passage by filling in each gap with one word from the box lunch ;leaves ;in ;at ;eleven ;teacher ;near ;to ;goes ;starts This is my sister, Trang. She is a (1)…… She teaches at a small school (2)…… the village. She gets up (3)…… six. Every morning she (4)……the house at quarter to seven. The school is not (5)…….my house, so she (6)…… to work by bicycle. Her class (7)……. at seven and ends at (8)……My sister rides home and has (9)…… at quarter (10)… twelve.
Ko chép mạng chỉ cần như vậy thôi nha nghĩ g8iuspp mk vs
Lúc nãy mình có đăng bài nhưng ko ai trả lời, mình đăng lại.. TCHH là tính chất hóa học
Em nhập số liệu trên file Excel sau đó lưu lại rồi tắt, sau đó BKAV hởi 1 file mở bằng BKAV đã thay đỏi có muốn lưu ko, em ấn nhầm vào ko lưu, giờ vào tìm ko thấy file đó, mở excel vào file vẫn thấy mà ko mở được. Anh (chị) có cách gì giúp em với
fill each black with a suitable word in the box am , is , are , do , does , have 1 . Rapper Den Van Vau .................. Thanh's best friend 2 . Where .........Doan Van Hau often go shopping ? 3 . What ........ she often do at break time ? 4 . Ms Trang ........ our favourite teacher . She teacher literature . 5 . ............ ou thirsty ? 6 . How ........ you go to shool every morning , Tuan ? 7 . We ....... going to open a new library 8 . They often ......... english lesson on monday and thursday . 9 . ......... your brother like pop music ? 10 . ....... Lan ....... watching TV at the moment . 11 . He ....... doing his homework at present . 12 . I ....... having dinner at Jane's house .
chỉ cần làm câu 10, 11,12,13 thôi nha mik đang cần gấp đề là: đặt câu hỏi cho từ gạch chân
Viết đoạn văn khoảng 10 câu nội dung tuỳ chọn trong đó có sử dụng khởi ngữ và các thành phần biệt lập *lưu ý : gạch chân chỉ rõ và ko chép mạng nha
giúp mình nhanh với ạ mình vote cho 5*
Giúp mình bài 2,3 với ạ Mik cảm ơn hứa ctlhn
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến