limites

1)lim(x→4)⁡〖(x-4)/(x^2-x-12)〗







2)lim(x→2)⁡〖(x-2)/√(x^2-4)〗

3)lim(x→∞)⁡〖(2x+3)/(4x-5)〗

4)lim(x→∞)⁡〖(2x^2+3)/(6+x-3x^2 )〗

5)lim(x→∞)〖x/(x^2+5)〗