Việt Nam muôn năm , vô địch rồi !!!!!!!!!!!!!!!!!!!!!!!!

U23 VN vô địch!! yeahhhhhhhhhhhhhhhhhhhhhhhh , vào đk chung kết là w hay rồi

đăng câu linh tinh nhiều thế bạn ,nhưng kb thì kb thôi -_-"

mk nè k mình nha

cố lên 

VN vô địch

 As you know, there are many festivals around the world now and I think each festival has their own special things. But the festival I love best is Japan Summer Festival. I enjoyed this festival with my family in Japan last week. It was very wonderful. This festival had a lot of activities for people to attend. The outdoor activities and the interesting atmosphere are the most exciting in the festival. Everybody wore kimono or yukata to join the Summer Festival. It's a traditional clothes of Japanese. Anh of course I wore a kimono to take part in the festival. There, everyone can play and enjoy the festival together. I think it made people closer. What a wonderful memory! I love Japane so much.

ở MB nước ta thôi

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~Study well~

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\(B=\frac{1+2+2^2+2^3+...+2^{2008}}{1-2^{2009}}\)

Đặt: \(A=1+2+2^2+2^3+....+2^{2008}\)

\(\Rightarrow2A=2+2^2+2^3+2^4+...+2^{2009}\)

\(\Rightarrow2A-A=\left(2+2^2+2^3+2^4+...+2^{2009}\right)-\left(1+2+2^2+2^3+....+2^{2008}\right)\)

\(\Rightarrow2^{2009}-1\)

\(\Rightarrow B=\frac{2^{2009}-1}{1-2^{2009}}\)

Dvddfdfdc

Ccd

a) 17+25+13+45=100

=(17+13)+(25+45)=30+70=100