Cho tam giác ABC vuông tại A, AB = 3cm, AC = 4cm. a, Tính độ dài BC. b, Tính góc B và góc C

Có 9 người xếp thành 1 hàng dọc biết có hai bạn luôn đứcng cạnh nhau. Có bnh cách sắp xếp ?

Mn làm giúp mik vs ạ đang gấp ạ . 22h nộp.bài roii ạ

Rút gọn biểu thức A = $\frac{1}{2}$ - $\frac{1}{2}$( x : $\frac{1}{6}$ - $\frac{1}{4}$ ) - 2| 3x -2 | khi: a) x ≥ $\frac{2}{3}$ b) x < $\frac{2}{3}$. 1 trong 2 cái nào cũng được :))

Mỗi bài 10 điểm nhé mình cần gấp

hãy viết một đoạn văn kể về mái trường của em.

-xác định số hạt p,e,n dựa vào S: Nguyên tử R có tổng số hạt là 40, trong đó số hạt mang điện nhiều hơn số hạt không mang điện là 12. Tìm số hạt p,e,n

Có ai giúp mình không ạ? Mình cần trước 10h, mình sẽ vote 5 sao

helppps meeeee, thanks you very!!!!

Ex 1. Use the past simple to complete these sentences 1. Yesterday, I (go)______ to the restaurant with a client. 2. We (drive) ______ around the parking lot for 20 mins to find a parking space. 3. When we (arrive) ______ at the restaurant, the place (be) ______ full. 4. The waitress (ask) ______ us if we ______(have) reservations. 5. I _____(say), "No, my secretary forgets to make them." 6. The waitress (tell)______ us to come back in two hours. 7. My client and I slowly (walk) ______ back to the car. 8. Then we (see) ______ a small grocery store. 9. We______ (stop) in the grocery store and (buy) ______ some sandwiches. 10. That (be) ______ better than waiting for two hours. 1. It was warm, so I ….. off my coat. (take). 2. The film wasn't very goor. I …… it very much. (enjoy) 3. I knew Sarah was very busy, so I ..... her (disturb) 4. I was very tired, so I ..... the party early. (leave) 5. The bed was very uncomfortable. I ..... very well (sleep) 6. The window was open and a bird ..... into the room (fly) 7. The hotel wasn't very expensive. It ..... very much (cost) 8. I was in a hurry, so I ..... time to phone you (have). 9. It was hard carrying the bags. They ..... very heavy. (be) 10. I thought that It would be awful, but finally It ……. (turn) out to be great!