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Năm ngoái mk thi thì là đề viết về "My dream house"!Còn năm nay thì mk ko biết!!
\(2xy-6y=10-x\)
\(2xy-6y-10+x=0\)
\(\left(2xy-6y\right)+\left(x-3\right)-7=0\)
\(2y\left(x-3\right)+\left(x-3\right)=7\)
\(\left(x-3\right)\left(2y+1\right)=7\)
Vì x, y là số nguyên nên x-3;2y+1 là số nguyên
Mà (x-3)(2y+1)=7 => x-3 ; 2y+1 thuộc Ư(7)
Mặt khác Ư(7) = { 1;-1;7;-7}
Ta có bảng sau:
| x-3 | 1 | -1 | 7 | -7 |
| 2y+1 | 7 | -7 | 1 | -1 |
| x | 4 | 2 | 10 | -4 |
| y | 3 | -4 | 0 | -1 |
Vậy cặp (x;y) nguyên thỏa mãn là (4;3) ; (2;-4) ; (10;0) ; (-4;-1)
1 . Students to live in the big city in Vietnam.
2 . My uncle took me to see the one pillar pagoda last sunday
3 . Nga did not go to school because she was tired
4 . Hanh needs to buy some stamps mail for overseas.
cho em nha. câu cuối nếu sai thì chị sửa cho em nha.
Bạn vào link này nhé!
https://www.anhngumshoa.com/tin-tuc/tat-tan-tat-ve-12-thi-trong-tieng-anh-co-ban-ndash-cong-thuc-cach-dung-va-dau-hieu-nhan-biet-37199.html
My name is Nhung. Today I'm going to tell about my best friend. I have many friends. But among my friends, I cherish most is Lan. She is a good student of my class. Lan has short black hair, an oval face and brown eyes. I when she glad because she looks so lovely when she smiles. She is a form of friends that I can share everything. She always help me in every situations. She s English, reading books and listening to music. Lan and I have a lot of common with each other, so we have been good friends over past years. I hope we will keep this friendship forever.
hi im Phuong. I have a lot of friends. my cherish most is Anh. she a good and clever friend. she has long black hair and brown eyes. she high 1m45. she so clever. sometime she greedy and kind.she favorite lesson is music. she play skipping . in the future she want to a doctoc
Ta có 3x( y + 1 ) + y + 1 = 7
3x( y + 1 ) + ( y + 1 ) = 7
( 3x + 1 )( y + 1 ) = 7
Vì x; y nguyên nên 3x + 1 và y + 1 nguyên
Vậy ( 3x + 1 ); ( y + 1 ) ϵ Ư( 7 ) = { 1; -1; 7; -7 }
Lập bảng giá trị
| 3x + 1 | 1 | -1 | -7 | 7 |
| y + 1 | 7 | -7 | -1 | 1 |
| x | 0 | \(\dfrac{-2}{3}\) ( loại ) | \(\dfrac{-8}{3}\) | 2 |
| y | 6 | 0 |
Vậy các cặp số nguyên ( x; y ) cần tìm để 3x( y + 1 ) + y + 1 = 7 là ( 0; 6 ); ( 2; 0 )
I live in a house at ____(Bạn tự điền tên đường vào nhé!) street with my family. My house is small but it is very beautiful. It has 3 bed room, one for my parent, one for my sister ( hoặc là brother, tùy bạn chọn thôi) and one for me. The living room is small but it is very nice and the kitchen is very convenient. My house also has a small garden with some trees and flowers that my father is planted. My house isn't large but it very beautiful, and I enjoy it very much.
Bạn có cần dịch không
dang sau any cong voi 1 danh tu nao do
minh cung k chac ..he..he
Cảm ơn cậu, nguyễn thị thùy dung nhé. Đúng là cộng vs danh từ nhưng khi nghe kỹ thì đáp án là roses
Đây mà là Tiếng Anh ak ?
Đây là toán chứ bạn