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Determinati ultima cifră a numarului x=2015^2019+2016^2019+2017^2019+2017^2019+2018^2019

Răspuns :

Renatemambouko
x=2015^2019+2016^2019+2017^2019+2017^2019+2018^2019
Uc(2015^2019)=Uc(5^2019)=5
Uc(2016^2019)=Uc(6^2019)=6
Uc(2017^2019)=Uc(7^2019)=Uc(7^504*4+3)=Uc(343)=3
Uc(2018^2019)=Uc(8^2019)=Uc(8^504*4+3)=Uc(512)=2
Uc(x)=Uc(2015^2019+2016^2019+2017^2019+2018^2019)=
=Uc(5+6+3+2)=Uc(16)=6

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