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You can use the pyobject method:

sage: b = RealField(200)(5)
sage: bb = (b^x).operands()[0]
sage: bb.pyobject(), type(bb.pyobject()) 
(5.0000000000000000000000000000000000000000000000000000000000, <type 'sage.rings.real_mpfr.RealNumber'>)