∫ （3^x +根号x）dx
=∫3^xdx +∫(根号x)dx
=∫d（3^x）/ln3 + ∫ 2/3d x^(3/2)
=3^x/ln3 +2/3x^(3/2)+C
带入0 1
得到原式= 3/ln3+2/3×+C- 1/ln3 +C
=2/ln3 +2/3 -1/ln3
=2/ln3+2/3