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Viet Nam has gained three main benefits since it joined different international organisations. Firstly, it is easier and more convenient for Viet Nam to promote its culture and learn about other cultures. For example, various cultural exchanges help foreigners know more about our country. In addition, Vietnamese people have a better chance of experiencing different cultures. Secondly, this has created greater education opportunities for both Vietnamese and foreign students. More education opportunities abroad are now open to Vietnamese students. Viet Nam's colleges and universities can also accept international students. Finally, joining these organisations has also helped Viet Nam increase both local and international tourism. In fact, Viet Nam has become one of the most popular destinations for many foreign tourists in the region. It is also easier for Vietnamese people to travel abroad. In short, Viet Nam has benefited greatly from becoming a member of different international organisations.

The surgeon's job is traditionally most common for men. Surgeons have to perform operations on patients. They also have to make important decisions about patients' health and safety. Besides medical knowledge, surgeons need both physical and mental strength to perform long and tiring operations. In addition, surgeons need to have excellent eyesight and skilful hands. A surgeon works with a team, so he / she needs good teamwork and communication skills. Although it is traditionally seen as a male job, the number of women surgeons is increasing now. Women as mentally strong as men, and they can perform long operations. In summary, women can make great surgeons, and everybody will benefit from having both male and female surgeons.

The surgeon's job is traditionally most common for men. Surgeons have to perform operations on patients. They also have to make important decisions about patients' health and safety. Besides medical knowledge, surgeons need both physical and mental strength to perform long and tiring operations. In addition, surgeons need to have excellent eyesight and skilful hands. A surgeon works with a team, so he / she needs good teamwork and communication skills. Although it is traditionally seen as a male job, the number of women surgeons is increasing now. Women as mentally strong as men, and they can perform long operations. In summary, women can make great surgeons, and everybody will benefit from having both male and female surgeons.

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Florence Nightingale is most famous for being the founder of modern nursing.

She was born in 1820 in Florence, Italy. She grew up in England with her parents and older sister. In 1844, she studied nursing in Germany and later went to London to work in a hospital. In 1854, Florence went to the military hospital in Scutari, Turkey, with 38 other women. They cleaned the hospital and improved conditions for the wounded soldiers. The death rate dropped from sixty percent to two percent within six months. In 1855, Queen Victoria gave Florence an award and a piece of jewelry. Florence wrote Notes on Nursing in 1859 and in 1860, she opened St. Thomas' Hospital where she started the Nightingale Training School for Nurses. In 1908, she was given the merit of honor by King Edward VII. She died two years later in London. Florence Nightingale will be remembered for being the founder of modern nursing.

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Đáp số : X > Y

Đề câu a là \(\dfrac{-1}{4+x}-2\) phải không bạn. Trong trường hợp này x=-4 biểu thức không xác định nên không thể với mọi x được.

Ta có thể dùng cosy hoặc đặt a,b lần lượt là hai số hạng vế trái của phương, đưa phương trình về hệ phương trình không triệt để. Từ đó giải phương.

Đầu kiện: \(x\ge0\)

Ta có:

\(4\sqrt{x}=2\sqrt{4x}\le4+x\\ \Rightarrow x^2+4-4\sqrt{x}\ge x^2-x\\ \Rightarrow\sqrt{x^2+4-4\sqrt{x}}\ge\sqrt{x^2-x}\) 

\(6\sqrt{x}=2\sqrt{9x}\le9+x\\ \Rightarrow\sqrt{x^2+4-6\sqrt{x}}\ge\sqrt{x^2-x-5}\)

Suy ra \(1\ge\sqrt{x^2-x}+\sqrt{x^2-x-5}\)

Đặt \(\sqrt{x^2-x}=a;0\le a\le1\\ \sqrt{x^2-x-5}=b;0\le b\le1.\\ \Rightarrow a^2-b^2=\left(x^2-x\right)-\left(x^2-x-5\right)=5.Vôlí\)

Vậy phương trình đã cho vô nghiệm.

a.

Số 2 ở hàng đơn vị trong dãy số trên là dãy số: \(22;32;42;...;292;302\)

Số chữ số 2 ở hàng đơn vị trong dãy số trên bằng: \(\dfrac{302-22}{10}+1=29.số\)

Số 2 được viết ở hàng trục trong dãy số trên là dãy số:\(20;22;24;26;28;\\ 120;122;124;126;128;\\ 220;222;224;226;228\)

Số chữ số 2 được viết ở hàng trục là: \(5\times3=15.số\)

Số 2 được viết ở hàng trăm là dãy số: \(200;202;204;....;296;298\)

Số chữ số 2 được dùng ở hàng trăm trong dãy số trên là: \(\dfrac{298-200}{2}+1=50.số\)

Số chữ số 2 được dùng trong dãy số đã cho là: \(29+15+50=94.số\)

b.

Dãy số \(14;16;18;...;98\) cần dùng số chữ số để viết là: \(\left(\dfrac{98-14}{2}+1\right)\times2=86\)

Để viết được 366 chữ số ta cần dùng thêm các số có 3 chữ số để viết thêm: \(366-86=280.số\)

Ta có \(280:3=93.dư.1\)

Vậy chữ số 366 là chữ số hàng trăm của số thứ 94 trong dãy: \(100;102;....;304\)

Số thứ 94 trong dãy trên bằng: \(\left(94-1\right)\times2+100=286\)

Chữ số 366 trong dãy số đã cho là chữ số 2.