8. a) (2²⁰¹⁷+2²⁰¹⁶+2²⁰¹⁵) : (2²⁰¹⁰ + 2²⁰⁰⁹+2²⁰⁰⁸) = 2²⁰¹⁵ (2²+2+1) : ( 2²⁰⁰⁸ (2²+²+1))=
=7 x 2²⁰¹⁵: ( 7 x 2²⁰⁰⁸) = 1 x 2⁷ = 2⁷ = 128
b) 2017²⁰¹⁷ - 2016 x 2017²⁰¹⁶ - 2016⁰ x 2017²⁰¹⁶= 2017²⁰¹⁷ - 2016 x 2017²⁰¹⁶ - 1 x 2017²⁰¹⁶
=2017²⁰¹⁷ - 2017 x 2017²⁰¹⁶ = 2017²⁰¹⁷-2017²⁰¹⁷=0
