Question

aflati ultima cifra a nr B=9^3110+8^3110+5^3110
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Answer 1

Răspuns:

u(9^3110)=1

9^1=9

9^2=81

_______

9^3=729

u(8^3110)=4

8^1=8

8^2=64

8^3=512

8^4=4096

_________

8^5=32768

3110:4=777 rest 2

u(5^3110)=5

5^1=5

5^2=25...

1+4+5=10 =>ultima cifră este 0