∫(2,3) (√x+1/√x)^2 dx
=∫(2,3) x+1/x+2 dx
=x^2/2+lnx+2x |(2,3)
=(9/2+ln3+6)-(2+ln2+4)
=4.5+ln(3/2)
有不懂欢迎追问