Hello,

I am unable to reproduce the error you obtained.  Here is what I get in
3.2.2:


----------------------------------------------------------------------
| Sage Version 3.2.2, Release Date: 2008-12-18                       |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: proofStrain,f_y,gamma_ms = 0.002, 250, 1.1499999999999999
sage: abc = 3150/(2000*(proofStrain + 5.00000000000000e-6*f_y/gamma_ms) + 7)
sage: abc
239.108910891089
sage: abc.n(digits=5)
239.11


Best,
Alex





-- 
Alex Ghitza -- Lecturer in Mathematics -- The University of Melbourne --
Australia -- http://www.ms.unimelb.edu.au/~aghitza/

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