def f(x)
    a0=Rational(156,1)
    a1=Rational(-1251,4)
    a2=Rational(4987,24)
    a3=Rational(-215,4)
    a4=Rational(113,24)
    a5=Rational(0,1)
    xr=Rational(x,1)
    [a0,a1,a2,a3,a4,a5].each_with_index.map{|a,i|a*(xr**i)}.inject(:+)
end
 
(1..5).each{|x| puts f(x) }