dom F(X)=2 X+X^(2)
240รท400
(-27)^(1/3)
81^(1/2)
$2^{23624}$
81^1/2
[matematik]\displaystyle{ \prod_{k=3}^\infty \cos\left(\frac\pi k\right) = 0.1149420448\dots. }[/matematik]
2^(n)(An^2+Bn+C)-4{2^(n-1)[A(n-1)^2+B(n-1)+C]}+4{2^(n-2)[A(n-2)^2+B(n-2)+C]} -(n+1)2^n = 0
2^n(An^2+Bn+C)-4{2^(n-1)[A(n-1)^2+B(n-1)+C]}+4{2^(n-2)[A(n-2)^2+B(n-2)+C]} -(n+1)2^n = 0
q^2+7q+6=0
