Bài 1: Với các số `a,b,c>0` thoả mãn `a+b+c=1` Chứng minh `frac{a}{1+9b^2}+frac{b}{1+9c^2}+frac{c}{1+9a^2}\geq1/2` Bài 2: Tìm GTNN của `A=frac{x+3\sqrt{x-2}}{x+4\sqrt{x-2}+1}`

giúp mình làm bài này với ạ!!!! Cảm ơn mn

Make the questions for the underlined words. 1. It is 2 kilometers from my house to the market. …………………………………………………………………………………………………….. 2. The weather is cool and wet now in London. …………………………………………………………………………………………………….. 3. My sister works in Sydney, Australia. …………………………………………………………………………………………………….. 4. We will stay there for a week. …………………………………………………………………………………………………….. 5. Hoa received her aunt’s letter five days ago. ……………………………………………………………………………………………………..

So sánh đặc điểm kinh tế của ba khu châu Phi( nêu điểm giống và khác nhau)

Cho tam giác ABC vuông tại A, biết AC=12, BC=13 .Tính cạnh AB

ai giúp em bài trắc nghiệm anh với ạ

Read the descriptions below of the various activities available around Hanoi. Then write A, B, C, D or E to show the most suitable activity for each of the people below. 1. Mr. Hung is retired but dislikes being with groups of elderly people. He doesn’t like sports, either. An opportunity to get away from the noise of the city and to enjoy the nature is most suitable for him. 2. Mrs. Ha wants someone to look after her children for an hour three times a week while she goes to an accounting class. 3. Tuan wants to learn swimming in the afternoon after university. 4. Mr. and Mrs. Binh are over 60 years old. They want to go out and meet people of the same age. 5. Phuong and her friends want to play some sports together in the evenings, after classes. A. This Mystery Park is part of National Park. Sailing, swimming and other water sports are available at club, with professional teachers. Fishing is available for Mystery Park Club members only (minimum age 18). B. The City Farm is for everyone who loves animals and wants to learn more about trees and fruit. There are horses, cows, and various kinds of children on the farm. There is also a large orchard with many kinds of fruit: oranges, grapefruit, pineapples, etc. Children under 14 must come with adults. C. The Local Community Sports Center offers a variety of activities: table-tennis, badminton, indoor football and karate. It is open every day except for Monday, open from 5p.m to 10p.m. D. The Walking Club meets every Saturday morning. Club members take part in walks and discussion. Suitable for retired people. E. The Play Center with a lot of activities for children is open every day. There are different play areas for different ages. There are playground supervisors to take care of small children.

Vẽ dùm tớ cái hình thôi ... cảm ơn trước ạ

Mong mọi người giúp em câu này ạ: Giải thích vì sao những cây ưa sáng thường có thân cao, thẳng, thường nhỏ và xếp xiên. Lấy ví dụ về cây ưa sáng

h sinh ra trong 1 gđ giàu có bố mẹ bắt h làm việc kinh doanh nhưng h đam mê hội họa . nếu là em em sẽ làm như thế nào để thực hiện đam mê hội họa ? nhận xét hành vi của bốm mẹ h