`S = x^2 + y^2 + 2xy - 6x - 6y + 25`
` = (x^2 + 2xy + y^2) - (6x + 6y) + 25`
` = (x+y)^2 - 6(x+y) + 25`
` = 3^2 - 6.3 + 25` (vì `x + y = 3`)
` = 9 - 18 + 25`
` = -9 + 25 = 16`
Vậy `S = 16`
$\text{Đáp án+Giải thích các bước giải:}$
$x²+y²+2xy-6x-6y+25$
$= (x+y)²-6(x+y)+25$
$= 3²-6.3+25=9-18+25=16$
Giải nhanh và chính xác hộ tui nhen:)))
Lm giúp mình vs ạ mik cảm ơn trc
Giải giúp mình câu này với mình cần gấp
Hộ em 2 bài 2 với 3 ạ chỉ làm phần a cả 2 nài thôi ạ
Giúp mình với mình đang cần gấp
Giải giúp mình bài này với mình cần gấp
ai là người phát minh ra thuyết vạn vật hấp dẫn???
change into gerund or the infinitive: cần gấp plsssss She admitted (steal)……………………………. the money. I chose (work)………………………………… here. She waited (buy)…………………..………… a drink. I really appreciate (be) …………………………….on holiday. I couldn't help (laugh)………………..…………...when I heard his joke. It seems (be)…………………………. raining outside. They considered (move) ……………….…………….to a new apartment in the suburb. She practised (speak)……………………………….English at the club. FinallyI managed (finish)………………………… the work in time. I really can't stand (wait) ……..………………….for the bus. Unfortunately,we can't afford (buy) ……………………………a new car this year. She risked (be)………………………….. late. I'd love (come)………………………… with you this weekend. I prepared (go) ………………………………..on holiday with my family. Her job involves (move) …………………………… around the country a lot. We intend (go) ……………………….to the countryside this weekend. I pretended (be)……………………… sick so I didn't have to go to work.
Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. 15. When we turned 16 years, our parents started to allow us going out at night until 10. A. turned B. going out C. allow D. started 16. Despite they are long-held traditions, something can be changed appropriately to make them more suitable with this modern life. A. Despite B. something C. changed D. with 17. You needn't wotch TV a lot ot night because it will make you feel very tired. A. very B. because C. needn't D. a lot 18. I love the countryside life although it was the most colorful part of my childhood. A. part B. the most C. although D. was 19. There were a lot more people joining the festival than I hadthought at firstly. A. at firstly B. joining C. were D. a lot more 20. The student fancy reading books on travel and tourism. A. fancy B. on C. reading D. tourism
ui mng ơi lm giúp mk nhanh nhất có thể vs ạ, đánh máy hộ mk nhá, Cảm ơn mng, đảm bảo dc cảm ơn và vote trên 4* ạ. Mk ki "po" xíu vì đng tiết kiệm điểm ạ.
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