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@abevieiramota
Created May 3, 2014 17:51
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# símbolos #
esi, xii = symbols('esi xii')
Rsdi = As*Es*esi
Rcdi = 0.85*fcd*b*0.8*xii
Rlsdi = Als*Es*((xii - dll)/(d - xii))*esi
faux1 = Rsdi - Rcdi - Rlsdi
esi = solve(faux1, esi)[0]
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