user-avatar
missjane27
2 năm trước
Rút gọn biểu thức A=`(x-y-1)^3 -(x-y+1)^3 +6(x-y)^2`
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I. Choose the word whose main stress is placed differently from the others in each group. 1. A. realize B. improve C. possible D. comfortable 2. A. important B. especially C. prefer D. influence 3. A. general B. opinion C. abroad D. surprise II. Choose the word whose underlined part is pronounced differently from the others. 4. A. seven B. level C. next D. ruler 5. A. jungle B. sunny C. bus D. surrounding 6. A. guessed B. invited C. decided D. naked II,Choose the correct answer. 7. ……………… I have a look at those shoes in the window, please? A. Must B. Would C. Should D. Could 8. We ……………… pay for the tickets as Josie won them in a competition. A.9. You really ……………… make such a mountain out of a molehill! A. can’t B. won’t C. mightn’t D. shouldn’t 10. You won’t ……………… to connect to the Internet once you’ve got broadband as you’re online twenty-four hours a day. A. need B. must C. ought D. able 11. I hope we ……………… find the cinema easily. A. could B. may C. might D. can 12. We couldn’t find a hotel room so we ……………… sleep in the car. It was awful! A. must B. should C. had to D. could 13. We’d love to ……………… afford to go on a round-the-world cruise. A. can B. be able to C. will have to D. have to 14. You’ll ……………… tell the police that your house was broken into. A. have to B. must C. had to D. should mustn’t B. didn’t have to C. couldn’t D. hadn’t to V. Write one word in each gap. When I broke my arm a week ago, I guess it (42) …………………………. to have hurt. But it didn’t! We were doing PE at school, and we were making a pyramid. We (43) …………………………. to stand on each other’s shoulders. I was right at the top. We (44) …………………………. have been doing it properly because suddenly the pyramid collapsed and we all fell. I landed on my arm. Mr. Jenkins (45) …………………………. have known immediately that I’d broken my arm because he sent someone to call an ambulance. ‘Sit still, and don’t move your arm at all until the ambulance comes’, he said. I (46) …………………………. still remember the feeling - my arm was numb, and looked very strange, but there was no pain at all. I remember thinking: ‘It (47) …………………………. be broken. If it was broken, I’d be in agony. ‘I suppose not feeling any pain (48) …………………………. have been because I was in shock. The plaster (49) …………………………. come off in about three weeks but it (50) …………………………. have to stay on longer. It depends on whether the break has healed properly or not. The next three weeks may (51) …………………………. be the best three weeks of my life - no basketball, no playing in the playground, no swimming - but I’m counting my blessings. It (52) …………………………. have been a lot worse!

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team