Updates:
        Status: Duplicate
        Mergedinto: 2814

Comment #1 on issue 2831 by [email protected]: bug in simplify
http://code.google.com/p/sympy/issues/detail?id=2831

Try to rationalize the expression. That pretty much does the simplification you (might) want:

z.subs([(p, nsimplify(p, rational=True)) for p in z.atoms(Pow) if p.exp.is_F
loat])
0.0257226950619007*x**(1/3)*y/(-1.0*x**(8/3) - 0.0261211729852336*y) + 0.0514453
901238014*x**3*y/(-1.0*x**(8/3) - 0.0261211729852336*y)**2
zz=_
zz.count_ops()
23
simplify(zz).count_ops()
23


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