(1-x)^1/3=t,1-x=t^3,dx=-3t^2dt
∫x^2(1-x)^1/3dx
=∫(1-t^3)(-3t^3)dt
=3∫(t^6-t^3)dt
=3(t^7/7-t^4/4)+C
=3t^4(t^3/7-1/4)+C
把(1-x)^1/3=t代入即可