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Aflati ultima cifra din urmatoarele numere :
A=7x36+5la puterea43+9
B=2la puterea123+1
C=3la puterea72+7la puterea46


Răspuns :

u(A) =U (U(42)+5+9)=U(2+5+9)=U(16)=6

U(B)=U(2^123+1)=U (2^3+1)=U(8+1)=9


U (C) =U ( 3^4+7^2)=U(1+9)=U(10)=0
as simple as that!!