解：原式=(a+b)^2(a-b)^2/(a+b)(a-b)^3/a^3/a/b^3=a^2b^2(a+b)/(a-b)=4/9*4/9*(-4/3)/0 ∴原式无意义如果满意，请采纳
如果，原式化简为(a+b)/(a-b)则=[(a+b)/b]/[(a-b)/b] =(a/b+1)/(a/b-1) =(1/3)/(-5/3) =-1/5
