Chứng minh bất đẳng thức: \(4ab\left(a+b\right)\left(a+1\right)\left(a+b+1\right)+b^2\ge0\)

Giải thích hiện tượng khi lặn sâu xuống nước thì có cảm giác đau tai.

Viet phuong trinh cho chuoi sau:

Na ----> Na2O ----> NaOH -----> H2

She is the girl. He wants to win her heart ( Su dung dai tu quan he )

=> She...............................................

Trình bày hậu quả của cuộc chiến tranh thế giới thứ hai - Nêu nhân xét và suy nghĩ của mình? Liên hệ việc chống chiến tranh và bảo vệ hòa bình hiện nay

Cho biết biểu thức M = \(\dfrac{x+2}{x+3}+\dfrac{5}{6-x^2-x}+\dfrac{1}{2-x}\)

a) Tìm điều kiện xác định và rút gọn biểu thức

b) Tìm giá trị của x để M = 0

c) Tìm x nguyên để M có giá trị nguyên

Al + H2SO4 --> Al2(SO4)3 + H2O

Cho hình thoi ABCD, góc B = 60 độ. Kẻ AE vuông góc với BC, AF vuông góc với CD.
a) C/m : AE=AF
b) C/m : Tam giác AEF đều
c) Biết BD = 16cm. Tính chu vi tam giác AEF và chu vi hình thoi ABCD

Help me

Conditinal sentences: mixed types

1. When he left school he became a fisher man. His family didn't like it at all. They (BE) mych happier if he (BECOME) a greengrocer like his father.
2. They still say that if he (GO) into the greengrocery buisness when he left school he (BE) comfortably off now instead of being poor.
3. But he says that if he (HAVE) his life again he (MAKE) the same choice.
4. So many parcels and no baskets! If I (KNOW) that he we were going to buy so much I (BRING) a basket.
5. No one bathes here. The water is heavily polluted. If you (BATHE) in it you (BE) ill for a fortnight.
6. I can hear the speaker all right but I wish I could see him too. If he (STAND) on a barrel we all (SEE) him and that (BE) much better.
7. Look at poor Tom trying to start his car by hand again! If I (BE) Tom I (GET) a new battery.
8. I expect you'll see Jack at the lecture tonight. If you (DO) you please (REMIND) him about tomorrow's meeting?
9. The headmaster decided that Peter was the culprit and expelled him from the school. A more intelligent man (REALIZE) that Peter couldn't have been guilty. (If the headmaster had been more inteligent he...)
10. But I blame the real culprit even more. If he (ADMIT) his guilt Peter (NOT BE) expelled.