Tìm tất cả các số nguyên dương `a,b` sao cho `a+b^2` chia hết cho `a^2b-1`

Cho dãy số : 1,2,3,4...........,124,125. Hỏi dãy số có bao nhiêu chữ số

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-What does your brother do? à What is.........................................................................................? 2-What do you do? What is .............................................................................................? 3. The red dress is cheaper than the black one. à The black .................................................................... 4. The white car looks older than the black one.  The black car .......................................................................... 5. The dinner is so delicious. à What ..................................................................! 6. The school is very new. à What ...................................................................................! 7. There is a sink and a tub in the bathroom. à The bathroom ............................................................... 8.My father looks after sick children in Xuyen A hospital.  My father takes ..................................................................... 9. He is looking after her grandmother because she feels sick. à He is taking ................................................................................. 10-It isn’t difficult to do this exercise. It is ..................................................................................................................

Chuyển đổi các câu sau thành nghi vấn và phủ định . 6.I like watching cartoons. → ___________________________________________________________________________ → ___________________________________________________________________________ . 7. Her brother works in a big hospital. → ___________________________________________________________________________ → ___________________________________________________________________________. 8. She has English and History on Fridays. → __________________________________________________________________________ → ___________________________________________________________________________. 9. My father travels to work by car → ___________________________________________________________________________ → ___________________________________________________________________________ 10. We have dinner at 7 o’clock every evening → ___________________________________________________________________________ → ___________________________________________________________________________

Chứng minh rằng : E \ (A ∩ B)=(E\A) ∪(E\B) Giúp mình với mọi người ơi.Thanks ạ

III. Choose the best answer. 1. My dad doesn’t mind my mom from work every day. A. pick up B. picked up C. picking up D. picks up 2. Using computers too much may have harmful effects your minds and bodies. A. on B. to C. with D. onto 3. I love the people in my village. They are so and hospitable. A. friendly B. vast C. slow D. inconvenient 4. Among the , the Tay people have the largest population. A. groups B. majorities C. ethnic minorities D. ethnic cultures. 5. People in the countryside live than those in the city. A. happy B. more happily C. happily D. less happy 6. Viet Nam is multicultural country with 54 ethnic groups. A. a B. an C. the D. A and C 7. We to the countryside two months ago. A. go B. have gone C. went D. will go 8. What will you do if you the final examinations? A. will pass B. would pass C. pass D. passed 9. It rained hard. , my father went to work. A. Therefore B. However C. Because D. So 10. Your sister writes poems and stories, she? A. does B. doesn’t C. will D. won’t

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Cho `x;y` là các số thực lớn hơn 1. Tìm giá trị nhỏ nhất của biểu thức: `B=x^2/(y-1)+y^2/(x-1)`

Giúp em vs ạ dạng này khó hiểu quá