Question 213284
(ab+b^2/4ab^5)/(a+b/6ab^2b^4)
Invert and multiply
= (ab+b^2/4ab^5)*(6ab^2b^4)/(a+b)
= b*(a+b)*6ab^2b^4/(4ab^5*(a+b)
Cancel (a+b)
= 6ab^7/4ab^5
= 3b^2