Question

[mega man x and zero]

K=4/2.4+4/4.6+4/6.8+...+4/2008.2010

Answer 1

[Nguyễn Đỗ Minh Phương]

K=2.(2/2.4+2/4.6+2/6.8+...+2/2008.2010)

K=2.(4-2/2.4+6-4/4.6+8-6/6.8+...+2010-2008/2008.2010)

K=2.(1/2-1/4+1/4-1/6+1/6-1/8+...+1/2008-1/2010)

K=2.(1.2-1.2010)

K=2.502/1005

K=1004/1005