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Cioancadana330
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gaseste ultima cifra a numarului 2019+7²⁰¹⁹​

Răspuns :

Kawaiimath

u(2019+7^2019)

u(7^2019)

7^1=7

7^2=49

7^3=343

7^4=....1

7^5=....7

................

=> 2019:4=504 rest 3 => u(7^2019)=u(7^3)=3

u(2019+7^2019)=u(9+3)=u(12)=2

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