Đáp án:
`(x-y)(y-z)(x-z)`
Giải thích các bước giải:
`x²(y-z)+y²(z-x)+z²(x-y)`
`=x²y-x²z+y²z-xy²+xz²-yz²`
`=x²y-x²z+y²z-xy²+xz²-yz²+xyz-xyz`
`=(x²y-x²z)-(xyz-xz²)-(xy²-xyz)+(y²z-yz²)`
`=x²(y-z)-xz(y-z)-xy(y-z)+yz(y-z)`
`=(y-z)(x²-xz-xy+yz)`
`=(y-z)[x(x-z)-y(x-z)]`
`=(x-y)(y-z)(x-z)`
`x^2(y-z)+y^2(z-x)+z^2(x-y)=(y-z)(x-y)(x-z)`
`x^2(y-z)+y^2(z-x)+z^2(x-y)`
`=x^2(y-z)+y^2z-xy^2+xz^2-yz^2`
`=x^2(y-z)+yz(y-z)-x(y^2-z^2)`
`=(y-z)(x^2+yz)-x(y-z)(y+z)`
`=(y-z)(x^2+yz-xy-xz)`
`=(y-z)[x(x-y)-z(x-y)]`
`=(y-z)(x-y)(x-z)`
1. Jack admitted ....................... the money. A. steal B. to steal C. stealing D. stolen 2. Thank you very much ........................ lending me your bike. A. about B. in C. for D. of 10. The manager ....................... the men to turn to work immediately. A. insisted B. suggested C. demanded D. ordered 11. Her mother prevented her ..................... going out tonight. A. against B. from C. about D. at 12. I apologized ........................ the book at home. A. for leaving B. to leaving C. leaving D. to leave 13. The man wanted to avoid ...................... on security cameras. A. to see B. seeing C.to be seen D. being seen 14. Peter ........................ to go in for the exam. A. avoided B. let C. advised D. decided 15. I tried ........................... the bus, but I missed it. A. to catch B. catching C. to be caught D. being caught 16. The plants want ........................... daily. A. to water B. watering C. to be watered D. being water 17. Will you remind me .................... this letter at the post office? A. to post B. posting C. to be posted D. being posted 18. The goods ought ...................... two weeks ago. A. to deliver B. delivering C. to be delivered D. being delivered 19. I have expected ......................... the secret of happiness. A. to tell B. telling C. to be told D. being told 20. John had agreed ......................... me in his office. A. to meet B. meeting C. to be met D. being me
Complete the second sentence so that it means the same as the first sentence, using the adjective in capitals. 1. The first question was easier than the second one. (DIFFICULT) The second question 2. The black coat is smaller than the brown one. (BIG) The brown coat 3. The chair isn’t as comfortable as the sofa. (COMFORTABLE) The sofa 4. Jim’s suitcase was lighter than Jack’s suitcase. (HEAVY) Jack’s suitcase 5. His homework was better than mine. (BAD) My homework
Complete the sentences with the comparative form of the adjectives in brackets. Add than where necessary. 1. I think she is still ill. She looks even ___________________ last week. (bad) 2. Her job is a lot ___________________ mine. (stressful) 3. He thinks Charlie Chaplin is ___________________ Mr Bean. (funny) 4. I can’t study in this room. It’s too noisy. I’m going to find a _________________ place. (quiet) 5. Smart phones make our lives______________ and ______________. (easy - convenient) 6. Life in a city is a lot ___________________ life in the countryside. (good) 7. My Math class is ___________________ my English class. (boring) 8. I like this school because it is ___________________ the other one. (big) 9. A car is much ___________________ a bike. (expensive) 10. We need ___________________ actors for this film. (young)
56. It was so late that nothing could be done. => It was too……………………………………………………………... 57. He left school and then joined the army. => After ………………………………………………………………… 58. The leak was repaired by the plumber this morning. => The plumber ………………………………………………………….. 59.This flower is very beautiful! => How …………………………………………………………………! 60. Somebody stole his watch yesterday. => His watch ……………………………………………………………... 61. The last time she had a swim was five years ago. => She hasn't ……………………………………………………………… 62. I asked the hotel porter to wake me at 8 o’clock the following morning. => “Please………………………………………………………………... 63. They’ll have to change the date of the meeting again. => The date………………………………………………………………. 64. The garage is going to repair the car for us next week. => We are going …………………………………………………………. 65. The bus take s longer than the train. => The train………………………………………………………………. 66. John has not had his hair cut for over six months. => It is…………………………………………………………………….. 67. Maria says she’d like to have been put in a higher class. => Maria wishes………………………………………………………….. 68. Would you like me to finish the work tonight? => I’ll……………………………………………………………………... 69. You may get hungry on the train, so take some sandwiches. => In………………………………………………………………………. 70. My husband didn’t leave the car keys, so I couldn’t pick him up at the station. => If my husband…………………………………………………………..
Đọc và tóm tắt bằng sơ đồ hộ mình nha mình cần gấp lắm T_T The Summer Olympic Games The Summer Olympics are held every four years. They are held in different cities around the world. Athletes at the Games compete to win medals for their countries. They participate in hundreds of events. Let's look at some events. Water Sports One water sport is swimming. Some swimming races are short, and swimmers swim only two lengths of the pool. Other races are longer. Some swimming races use only one kind of stroke. In one race, swimmers can choose the type of stroke they want to use. Diving is another water sport. In diving events, dives jump from high above the water They twist , flip and turn while in the air. They get points for how well, they dive. Track and Field Track and field events include running , throwing , and jumping competitions. The marathon is the longest-running event. The shortest races are called dashes. In throwing events, athletes throw objects as far as they can. People competing in these events must be very strong. In jumping events athletes jump high or far. In the high jump, athletes leap over a bar. The bar is raised higher and higher until only one person can jump it. In the long jump, athletes leap as far as they can. Gymnastics Gymnasts leap, flip, and twirl through the air . They need strength, skill, and perfect timing. Only women compete in the balance beam event. They must balance on the beam while they turn and flip. Only men compete in the rings event. They hold onto the rings and flip their bodies in circles. Event Categories The Summer Olympics include many sports with hundreds of events. Which events do you like?
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