Question

-k^2/2k^2+1=-1/2+1/4k^2+2 怎么得出来的

Answer 1

-k^2/(2k^2+1)

=(-k^2-1/2+1/2)/(2k^2+1)

=[(-k^2-1/2+)/(2k^2+1)]+[(1/2)/(2k^2+1)]

=-1/2+[1/(4k^2+2)]