求不定积分∫e的三次根号x幂dx

z³ = x,dx = 3z² dz∫ e^[x^(1/3)] dx= 3∫ z²e^z dz = 3∫ z² de^z= 3z²e^z - 3∫ 2ze^z dz= 3z²e^z - 6∫ z de^z= 3z²e^z - 6ze^z + 6∫ e^z dz= 3z²e^z - 6ze^z + 6e^z ...