mn ơi giúp e đi e cho 5 sao vs lời giải hay nhất ạ

-Dựa vào ảnh, hãy kể tên các đồng bằng, con sông, dãy núi ở Bắc Mỹ.

Giúp mk.

Mọi người làm hộ mình cái , nhanh nhất cs thể nhá mn!!!

Cho tam giác ABC có BC = a,CA=b, AB = c thoả mãn b^2+c^2=a^2+√3bc.tìm số đo góc A

Hai ca nô cùng xuất phát từ A cùng đi về phía B hoặc C (A nằm giữa B, C). Qui ước chiều hướng từ A về phía B là chiều dương, chiều hướng từ A về phía C là chiều âm. Hỏi nếu hai ca nô đi với vận tốc lần lượt là 10km/h và -12km/h thì sau 2 giờ hai ca nô cách nhau bao nhiêu km?

Biết độ tan của muối Na2CO3 18°C trong nước ở 18°C là 21,2g . Làm lạnh 160g dung dịch Na2CO3 nóng có chứa 40g Na2CO3 về nhiệt độ 18°C . a) Tính số gam Na2CO3 tan trong dung dịch trên b) Có bao nhiêu Na2CO3 tách ra khỏi dung dịch?

Part 3. Choose the word or phrase that best fits the blank space in the following passage : Last week, Lan had a sore throat and she coughed (1)_________. Her mother gave her some tablets and asked her (2 )_________ them . But Lan did not feel better . So she had to stay at home for three days (3)_________ Monday to Wednesday. On Thursday, her aunt, Mrs Hoa visited her family and she suggested using honey, ginger, salt and lemon juice and mix them together. She asked Lan to drink a little sometimes. After two hours, she felt more (4) _________. One day passed, Lan's (5) _________ almost disappeared. Thanks (6)_________ her aunt's visit. Lan had a special cure for her sore throat. 1. A. a lot B. many C. lots D. few 1……….. 2. A. to drink B. drank C. drinking D. drink 2……….. 3. A. between B. on C. from D. on 3……….. 4. A. pleased B. important C. pleasant D. good 4……….. 5. A. disease B. energy C. key D. variety 5……….. 6. A. on B. for C. about D. with 6……….

từ MnO2,H2SO4 đặc ,KI,HgCl2 có thể điều chế trực tiếp được : a, những đơn chất nào b, những muối nào c,những axit nào

C. READING. Part 1. Read the passage and then answer the questions below: In the summer holiday, Mr. Lam, Mrs. Hoa and their children, Lan and Thuan, often go to the beach for two or three days. They always go to Vung Tau in the south of Viet Nam. They usually stay in a small house or a flat by the sea, but sometimes they stay in a hotel. Last summer they went to Nha Trang. They stayed at Seaview Hotel for three days. In the morning, Thuan played football with his father on the beach. Lan and her mother walked along the beach and built sandcastles. They visited Tri Nguyen Aquarium and saw different kinds of fish there. They also bought a lot of souvenirs for their friends. 1. Where does Lan’s family often go for their summer holidays? ->............................................................ 2. How long do they often stay there? ->...................................................................................................... 3. Where do they usually stay? ->.............................................................................................................. 4. Where did they go last summer? ->........................................................................................................... 5. What did Lan and her mother do there in the morning? ->....................................................................... 6. What did they see at Tri Nguyen Aquarium? ->.....................................................................................