cho hỏi tý làm tròn số thập phân thứ 2 là gì 8,53333333 làm tròn hộ nhé

Tính a [(-3/25)^0]^2014 b 230^3/23^3 c (-7)^n/(-7)^n-1(n $\geq$ 1)

Khử hoàn toàn 40 gam hỗn hợp Cuo và Fe2O3 cần 15.65 lít khí CO (đktc) .Tánh thành phần %mỗi oxit trong hỗn hợp

30 điểm nha! Hứa vote 5sao+ ctlhn+cảm ơn

Giúp tui với nhanh nha tui cần gấp

Cho hình thang vuông MNPQ có góc M = góc N = 90 độ , MQ = 32cm , NP = 40cm , MN = 17 cm. a.Tính diện tích hình thang MNPQ b. Tính góc P và QP?

1. Rút gọn các biểu thức sau: a. A = 1002 - 992+ 982 - 972 + ... + 22 - 12 b. B = 3(22 + 1) (24 + 1) ... (264 + 1) + 12 c. C = (a + b + c)2 + (a + b - c)2 - 2(a + b)2 //22 là 2bình phương 264 là 2 bình 64//

(x+y)^3-x^3-y^3 phân tích đa thức thành nt

Phân tích đa thức thành nhân tử em cần gấp lắm ạ!!! Gíup em với

Complete the sentence with the words in the box. acquaintances mutual give-and-take loyal incapable selfish friendship intimate emotional constancy trust sympathy 1. I have a lot of ________ at work but I don't have any real friends. 2. Despite differences in background and outlook, their partnership is based on _______ respect, trust and understanding. 3. Our relationship can not last longer because he seems to be very __________. He only thinks about himself. 4. I met her at the school opening in 1990. We have been _________ friends since then. 5. To keep a friendship, you can not always resist on your own way - there has to be some _________. 6. When all her other friends deserted her, Steve remained _________. 7. She is a brilliant mathematician, but as a lecturer, she is totally __________. 8. What do you know about a true _________? And what does it tell you? 9. You can _______ Jack to look after the money. He's completely honest. 10. The ________ of your love for Indian food really amazes me. 11. They really want to send my warm _______ to the people who lost their relatives in the earthquake on December 13th . 12. That song is so ___________. It always brings a tear to my eye.