Question

[Hà Dệu Anh]

2015/4034 < 1/2²+1/3²+1/4²+...+1/2016² < 2015/2016

Answer 1

[Vũ Minh DŨng]

1/2.3 +1/3.4+...+1/2016.2017 < 1/2^2+1/3^2+...+1/2016^2

1/2 -1/3+1/3 -1/4+...+1/2016-1/2017 <  1/2^2+1/3^2+...+1/2016^2

1/2-1/2017 <  1/2^2+1/3^2+...+1/2016^2

=> 2015/4034 < 1/2^2+1/3^2+...+1/2016^2

tương tự

 1/2^2+1/3^2+...+1/2016^2 < 1/1.2 +1/2.3+...+1/2015.2016

 1/2^2+1/3^2+...+1/2016^2 < 1- 1/2+1/2 -1/3+...+1/2015- 1/2016

 1/2^2+1/3^2+...+1/2016^2 < 1-1/2016

 1/2^2+1/3^2+...+1/2016^2 < 2015/2016

tích nha

Answer 2

[ThÍcH ThÌ NhÍcH]

nhìn cậu ngốc quáạ