5^2011 x 16^503 =
=5^2011 x (2^4)^503=
=5^2011 x 2^2012=
=5^2011 x 2^2011 x2=
=10^2011 x 2 =
=10......0 (2011 zerouri x2 = 20.....0 (2011 zerouri
suma cifrelor este 2+0*2011=2
50^20 x 2^28=
=2^20 x 25^20 x 2^28=
=5^40 x 2^48=
=5^40 x 2^40 x 2^8=
=10^40 x 2^8=
=10.....0 (40 zerouri) x 256 =
=2560.......0(40 zerouri)
suma cifrelor = 2+5+6+40*0=13
