Help me Help me Help me Help me Help me Help me Help me Help me Giúp mình với

Giúp mình với ạ. Tính bằng cách nhanh nhất nhé♥️♥️

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một tòa nhà cao tầng một người ở( vị trí a) có tầm mắt cách mặt đất 30m nhìn xuống vị trí c dưới một góc hạ là 60 độ . tính khoảng cách từ chân tòa nhà (vị trí b) đến c (làm tròn lên chữ số thập phân thứ 2)

Làm hộ em một cái avt dễ thương nha dùng app làm avt cũng được

Anh chị nào hiểu giúp em chỉ 1 bài này thôi ak giúp em với dc ko e sẽ vote ngay câu trlhn nè NHA NHA

X)-Choose the item among A, B, C or D that best answers the question about the passage. The country is more beautiful than a town and more pleasant to live in. Many people think so, and go to the country for the summer holidays though they cannot live there all the year round. Some have a cottage built in a village so that they can go there whenever they can find the time. English villages are not all alike, but in some ways they are not very different from one another. Almost every village has a church, the round or square tower of which can be seen from many miles around. Surrounding the church is the church yard, where people are buried. The village green is a wide stretch of grass, and houses or cottages are built round it. Country life is now fairly comfortable and many villages have running water brought through pipes into each house. Most villages are so close to some small towns that people can go there to buy what they can’t find in the village shops. 71. When do city people often go to the country? A. At the weekends. B. All the year round. C. At Christmas. D. The summer holidays. 72. What is the advantage of city people when they have a cottage built in the village? A. They can have their houses rented. B. They can go to the country at weekends. C. They can go to the country whenever they can find the time. D. All are correct. 73. What is the common feature of English villages? A. They have a church. B. They have a church with a tall tower, and a village green. C. They have a village green. D. They have running water. 74. What is NOT mentioned in the life of English villages? A. The village green B. The church C. Running water D. The Internet 75. What can villagers do when their villages are close to small towns? A. They can go there to buy whatever they want. B. They can go there to buy cheaper things. C. They can go there to buy what is not found in the village shops. D. They can go there to buy luxury goods.

1 1 1 __m2 +___m2+1___= ........... 3 3 3

CMR: với a,b là các số âm thì -Nếu a<b thì a ² >b ² -Nếu a ²>b ² thì a<b

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