8. Determine la incertidumbre absoluta y la incertidumbre relativa porcentual para cada cálculo. Exprese los resultados con una cantidad razonable de cifras significativas.

a) 9.23 ext{ (± } 0.03 ext{)} + 4.21 ext{ (± } 0.02 ext{)} - 3.26 ext{ (± } 0.06 ext{)} = ?

b) 91.3 ext{ (± } 0.1 ext{)} imes 40.3 ext{ (± } 0.2 ext{)} / 21.1 ext{ (± } 0.2 ext{)} = ?

c) rac{4.97 ext{ (± } 0.05 ext{)} - 1.86 ext{ (± } 0.01 ext{)}}{21.1 ext{ (± } 0.2 ext{)}} = ?

d) 2.0164 ext{ (± } 0.0008 ext{)} + 1.233 ext{ (± } 0.002 ext{)} + 4.61 ext{ (± } 0.01 ext{)} = ?

e) 2.0164 ext{ (± } 0.0008 ext{)} imes 10^3 + 1.233 ext{ (± } 0.002 ext{)} imes 10^2 + 4.61 ext{ (± } 0.01 ext{)} imes 10^1 = ?