Solución

a.   0.13495277 0.13495277  

b.   0.12594300 0.12594300  

c.   0.12509381 0.12509381  

d.   0.12500938 0.12500938  

e.   0.11614402 0.11614402  

f.   0.12406794 0.12406794  

g.   0.12490631 0.12490631  

h.   0.124990630.12499063  lim⁡x→21−2xx2−4=0.1250=18\mathop {\lim }\limits_{x \to 2} {{1 - {2 \over x}} \over {{x^2} - 4}} = 0.1250 = {1 \over 8}