Question

求助一个高等数学问题

Answer 1

u=√x

2udu =dx
∫dx/(1+√x)
=∫2udu/(1+u)
=2∫ [ 1- 1/(1+u) ] du
=2( u -ln|1+u|) +C
=2( √x -ln|1+√x|) +C