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determinati ultima cifra a nr a=4^2020+5^2021+6^2022​

Răspuns :

U( 4^2020+5^2021+6^2022)=.
=U(4^2020+5+6)=
=U[(4^2020:4)+5+6]=
=U[(4^4*505+0)+5+6]=
=U(4^0+5+6)=
=U(1+5+6)=
=U 12=
=2

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