Question

Calculați ultima cifră a16²⁰¹⁹+17²⁰¹⁹+18²⁰²⁰+19²⁰¹⁹+20²⁰²⁰​

Answer 1

Răspuns:

16^2019=u=6

17^2019=u=2019:4=504 r 3=u=7^3=u=3

18^2020=2020:4=505 =8^4=u=6

19^2019=2019:2=1009 r 1=9^1=u=9

20^2020=u=0

6+3+6+9+0=

9+6+9=

15+9=24

U=4