một hình tròn có diện tích 28,26 cm2 . hỏi hình tròn đó có chu vi bằng bao nhiêu?

Tính tổng các đơn thức sau : 3/4 xyz^2 ; 1/2 xyz^2 ; -1/4 xyz^2

- Underline adverbial phrases in following sentences. (2.5pts) ​1. We first met when he became the manager of the bank. ​2. I sometimes call on my younger sister when I'm in London ​3. After we had eaten, we played cards ​4. Take a packed lunch with you, in case you get hungry. ​5. There was a power failure earlier today and the trains are all running late now.mn giúp e với nhé e đg cần gấp lắm

3. It’s too late. I ______________ go now. 4. She gets bad marks at chemistry. She ______________ to study harder. 5. The traffic lights are red. You ______________ stop. 6. ______________ I go to the movies now? 7. She ______________ speak English when she was six. 8. Life is short. We ______________ waste it. 9. I ______________ do my homework last night because I was too tired. 10. You ______________ to walk alone after dark. It’s dangerous

Tìm toạ độ M trên đường thẳng 2x-y=0 cách A (-3;1) khoảng cách ngắn nhất

Tại sao nước vừa là nguyên liệu vừa là sản phẩm của quang hợp ?

vsv tổng hợp nhưng chất j ? nguyên liệu tổng hợp của các chất là j? những nguyên liệu đó đc cung cấp từ đâu?

: Người ta thả vật 500g cho rơi tự do, biết vận tốc lúc vật vừa chạm đất là 36km/h. Chọn gốc thế năng tại mặt đất. a. Cơ năng của vật lúc chạm đất là bao nhiêu? b. Độ cao nơi thả vật là bao nhiêu?

I am in San Francisco now. We arived here yesterday. Before that, we spent 10 days in New York. It is wonderful Liz and I Visited a lot of interesting places including the Empire State Building. We climbed to the top, it was very high and we were both a bit frightened. We also visited the Statue of Liberty. We walked through Greenwich Villlage and watched artists work. The paintings weren't expensive so I bought one. We also went to the theater. We enjoyed our holiday very much. The weather was OK a bit wet sometimes. But now in San Francisco it is hot and sunny. 1. When did Nga arrived in San Francisco? ……………………………………………………………… 2. How long was she in New York?

chất khí X có tỉ khối so với kk là 2,207 vậy X là