$\frac{(x^2+y^2)^2}{(x-y)^2}$ $\geq$ 8 xy=1 x>y

calli : I am very lazy (có trang trí, app not from chữ, có tâm)

The frozen extremes of the earth The Arctic in the north and the Antarctic in the south are at opposite ends of the planet, but they are similar in many ways. Both are lands of ice and snow, where the temperature in winter can be so low that your skin can freeze in seconds – it can be as low as –80°C. Very few animals are able to survive these conditions, but there are some both in the north and in the south. The Arctic has more plants and animals than the Antarctic, including polar bears, the largest bear in the world. In the south there are no land animals because of the extreme cold, but there are penguins and other sea animals that live on or near the coast – although both in the north and the south the sea is frozen for much of the year. One difference between the Arctic and the Antarctic is the human population. In parts of the Arctic there are towns and villages – Greenland, for example, the largest island in the world, has a population of 55,000 people. Many of these people work in fishing. They have a difficult life. There aren’t many roads between towns and villages, so people travel by snowmobile or with dogs. From November to January it’s dark for 24 hours a day, but from May to July there are 24 hours of daylight. In the Antarctic there are no normal towns and villages. Only scientists live there all year round, in special buildings called ‘stations’. They study the sea animals and learn about the history of the world’s climate by studying the weather and the ice. It’s a hard place to live, especially in winter, but many of them love it there and return again and again. 1​. There aren’t any animals in the Antarctic. ​A. True B.False C. Doesn’t say 2​. No people live in the Antarctic. ​A. True B. False C. Doesn’t say 3​. There aren’t any buildings in the Antarctic. ​A. True B. False C. Doesn’t say 4. ​It is usually –80 degrees in the Antarctic. ​A. True B. False C. Doesn’t say 5​. The sea in the Arctic is often frozen. ​A. True B. False C. Doesn’t say 6​. There aren’t any sea animals in the Arctic. ​A. True B. False C. Doesn’t say 7​. In Greenland, people don’t work in winter. ​A. True B. False C. Doesn’t say 8​. There aren’t any roads in Greenland. ​A. True B. False C. Doesn’t say 9​. In Greenland in June it’s light all the time. ​A. True B. False C. Doesn’t say

Hãy xác định khoảng cách giữa hai phao A và B

Hỗn hợp X gồm ZnSO4, CuSO4 và Fe2(SO4)3 (trong đó oxi chiếm 45,67% khối lượng; số mol CuSO4 bằng số mol ZnSO4). Cho m gam X tác dụng với dung dịch Ba(OH)2 dư thu được 239 gam kết tủa. Mạt khác, cũng m gam X tác dụng với dung dịch NH3 dư thu được 42,8 gam kết tủa. Tìm giá trị của m.

Use these words to write full sentences. Use the present continuous. 1. My family - go on a holiday - Ho Chi Minh City - next month. My family will go on a holiday in Ho Chi Minh City next month. 2. His hair - get longer, so he - have his hair cut - tomorrow. His hair is getting longer, so he will have his hair cut tomorrow. 3. I - attend - my friend's wedding - this weekend. I'm going to attend my friend's wedding this week. 4. Lisa - not come - my birthday party - this Saturday. . 5. Minh - go to university - five years.

Khử một lượng oxit sắt chưa biết H2 nóng dư. Sản phẩm hơi tạo ra hấp thụ bằng 50g axit H2SO4 98% thì nồng độ axit giảm đi 9,552%. Chất rắn thu được sau phản ứng khử được hòa tan bằng axit H2SO4 loãng thoát ra 4,48 lít hiđro (đktc).Tìm công thức của oxit sắt bị khử.

Một ô tô đi quãng đường AB với vận tốc 50km/h rồi đi tiếp quãng đường BC với vận tốc 45km/h. Biết tổng chiều dài hai quãng đường là 165km và thời gian ô tô đi quãng đường AB ít hơn thời gian ô tô đi quãng đường BC là 30 phút. Tính quãng đường AB (Giải Toán bằng cách lập pương trình)

1. Hệ thống lại các thì ngữ pháp (Cấu trúc, dấu hiệu, cách phát âm)

Mọi người cho mình xin đáp án câu 71 với ạ mình cảm ơn nhiều