Jaka jest cyfra jedności liczby 12 do potęgi 20.
12^1 = 12
12^2 = 144
12^3 = 1728
12^4 = 20 736
-------------------------
12^5 = 248 832
12^6 = .............4
12^7 = ............... 8
12^8 = .................6
------------------------------------
itd
20: 4 = 5 r 0 -----otrzymamy 5 takich powtórzeń, zatem
12^20 = ........6
odp. Jest to cyfra 6
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12^1 = 12
12^2 = 144
12^3 = 1728
12^4 = 20 736
-------------------------
12^5 = 248 832
12^6 = .............4
12^7 = ............... 8
12^8 = .................6
------------------------------------
itd
20: 4 = 5 r 0 -----otrzymamy 5 takich powtórzeń, zatem
12^20 = ........6
odp. Jest to cyfra 6