一元二次方程

def solve(eq,var=‘x‘):
    eq1 = eq.replace("=","-(")+")"
    c = eval(eq1,{var:1j})
    return -c.real/c.imag
      
>>> solve(‘2*x=5‘, ‘x‘)
2.5

equation = raw_input(‘enter equatino:‘)
try:
    n1, n2 = equation.split(‘X=‘)
except ValueError:
    n1, n2 = equation.split(‘x=‘)
print ‘answer is x=%.2f‘ % (float(n1)/float(n2))