Question

determinati ultima cifra a sumei s=5 la puterea129+7la puterea26

Answer 1

5 la orice putere =>u.c.=5

7p.2=49=>9

7p.3=343=>3

7p.4=2401=>1

:

:

:

7p.24=>1

7p.26=>9

9=5

14=>4