(a2/3+(ab)1/3+b2/3)×（a1/3－b1/3)=?

(a2/3+(ab)1/3+b2/3)×（a1/3－b1/3)=a^(2/3+1/3)+a^(1/3+1/3)*b^1/3+b^2/3*a^1/3-a^2/3*b^1/3-a^1/3*b^(1/3+1/3)-b^(2/3+1/3)=a-b。