Python 2.5 (r25:exportado, Jan 30 2007, 23:11:19) 
[GCC 3.4.6] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import math
>>> a = input('Entre o valor A da equacao: ')
Entre o valor A da equacao: 2
>>> b = input('Entre o valor B da equacao: ')
Entre o valor B da equacao: -3
>>> c = input('Entre o valor C da equacao: ')
Entre o valor C da equacao: 4
>>> d = math.pow(b,2)
>>> d
9.0
>>> e = (a)*(c)-4
>>> e
4
>>> f = 2*(a)
>>> f
4
>>> g = d+(e)
>>> g
13.0
>>> h = math.sqrt(g)
>>> h
3.6055512754639891
>>> i = -(b)+h
>>> i
6.6055512754639896
>>> j = i/f
>>> j
1.6513878188659974