Care este ultima cifra?

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Paraschiv Andreea
Euclid
Posts: 46
Joined: Wed Oct 08, 2008 5:38 pm

Care este ultima cifra?

Post by Paraschiv Andreea »

a=1^n+2^n+5^n, daca n=2009
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Paraschiv Andreea
Euclid
Posts: 46
Joined: Wed Oct 08, 2008 5:38 pm

Post by Paraschiv Andreea »

defapt este 1 la puterea n +2 la puterea n+5 la puterea n
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miruna.lazar
Bernoulli
Posts: 224
Joined: Wed Oct 08, 2008 8:41 pm
Location: Tulcea

Post by miruna.lazar »

Ultima cifra a lui \( 2 ^{2009} \)este 2009 : 4 = 502 rest 1 , adica 4k + 1 , adica Ultima Cifra = 2

=> 1 + 2 + 5 = 8 :)
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