Question

ex. 12 Determinați ultima cifra a numărului . Am nevoie la a),b),c),d),e) şi f).

Va rog frumos!!!

Answer 1

a)U(2⁸)= U(2⁴)²= U(16)=U(6)

b)U(3⁸)=U(3⁴)²= U(81)=U(1)

c)U(5⁸)= U(5) oricare ar fi exponentul.

d)U(5²⁰³ + 6²³⁵ +8⁴²⁹)= U( 5) +U(6)+U(8⁴²⁸*8)= U(5+6)+ U(8⁴)¹⁰⁷*U(8¹)=
=U(1) +U(4096*8)= U(1+48)= U(9)

e) U(2²⁰¹¹)= U(2⁴)⁵⁰² *U(2³)=U(16*8)= U(48)= U(8)

f)U(7²⁰¹¹)= U(7²⁰⁰⁸*7³)= U(7⁴)⁵⁰² *U(7³)= U (1*3)= U(3)