14) lim x^2-4/х+2 x-->2 15)lim х^2-16/х^2+5х+4 x-->-4 16) lim x-3/(x-5)*(2x-6) x-->3 17)...

Ииbb $lim_{x\to 2}\, \frac{x^2-4}{x+2}=lim\frac{(x-2)(x+2)}{x+2}=lim_{x\to 2}(x+2)=2+2=4\\\\\\lim_{x\to 4}\, \frac{x^2-16}{x^2+5x+4}=\lim\, \frac{(x-4)(x+4)}{(x-4)(x-1)}=lim_{x\to 4}\frac{x+4}{x-1}=\frac{8}{3}$

$lim_{x\to 3}\frac{x-3}{(x-5)(2x-6)}=lim\frac{x-3}{2(x-5)(x-3)}lim_{x\to 3}\frac{1}{2(x-5)}=\frac{1}{-4}\\\\\\lim_{x\to 2}\frac{x^2-5x+6}{x^2-12x+20}=lim\frac{(x-2)(x-3)}{(x-2)(x-10)}=lim\frac{x-3}{x-10}=\frac{1}{8}$