Tìm phân số có tử bằng 9 biết giá trị của nó lớn hơn -11/3 và nhỏ hơn -11/15

Tính giá trị của biểu thức một cách hợp lí: ($(50^{2}$ + $48^{2}$ + $46^{2}$ +...+ $2^{2}$) - ( $49^{2}$ + $47^{2}$ + $45^{2}$ +...+ $1^{2}$)

tìm x a, ( 2600 + 6400 ) - 3x =1200 b, [ (6x - 39) : 7 ] .4 = 12

Bài 1: Điền vào chỗ trống(tương lai gần ở dạng bị động) 1. She (work) __ here for five years. 2. I (study) __ all day. 3. You (eat) __ a lot recently. 4. We (live) __ in London for six months. 5. He (play) __ football, so he's tired. 6. They (learn) __English for two years. 7. (Cook) __ so I'm really hot. 8. She (go) __ to the cinema every weekend for years. 9. It (rain) __ the pavement is wet. 10. You (sleep) __ for twelve hour. 11. I (not/work) __ today. 12. You(not/eat) __ well recently. 13. We (not/exercise) __ enough. 14. She __ (not/study). 15. They (not/live) __ here for very long. 16. It (not/snow) __. 17. He (not/play) __ football for five years. 18. We (not/drink) __ enough water, that's why we feel tired. 19. I (not/sleep) __ I was reading. 20. They (not/watch) __ TV much recently. LÀM HỘ MIK VS Ạ

cho pt ax^+bx+c=0 có 2 no : x1;x2 và a>0 a) cmr nếu x1<=m<=x2 thì am^2+bm+c<=0 b) cmr nếu m<= x1<=x2 thì am^2+bm+c=>0 c ) cmr nếu x1<=x2<=m thì am^2+bm+c=>0

giải giúp em câu này với ạ. em cảm ơn ạ

mik cần cs đáp án sau 15p nx các bn giúp mik nha

Yêu cầu : - Đúng và chính xác nhất = 5* + Cảm ơn - Nhanh nhất, đúng và chính xác nhất = Câu trả lời hay nhất + 5* + Cảm ơn 11h đúng duyệt nha Cảm ơn trước !!!

Rewrite the sentences (2) 11. No one in my class is as tall as Tam. => Tam is the____________________ 12. I can't cook as well as my mother. => My mother can cook____________ 13. He does not play tennis as well as Jack. => Jack can___________________ 14. I did not spend as much money as you. => You spent___________________ 15. I don't think this book is expensive as it is .=> This book is____________ 16. He is the tallest boy in his class. => No one in_______________ 17. This is the most interesting film of all. => No other films are_____________ 18. No cars in the world are more expensive than Japanese ones. => Japanese cars _____ 19. This exercise is easier than that one.=> That exercise is not_________ 20. He drives more carefully than Jack does.=> Jack_____________

2bz-3cy/a=3cx-az/2b=ay-2bx/3c chứng minh rằng x/a=y/2b=z/3c