Question 310437
a^2-b^2 x ab^2
_______ _____
a^4 b 3a+3b 
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= {{{(a-b)*(a+b)*ab^2/(a^4b*3*(a+b))}}}
= {{{(a-b)*b^2/(3a^3b)}}}
= {{{(a-b)*b/(3a^3)}}}