[Toán 8] Giúp giùm

C

cchhbibi

2P=24([TEX]5^2[/TEX]+1)([TEX]5^4[/TEX]+1)([TEX]5^8[/TEX]+1)([TEX]5^{16}[/TEX]+1)
=([TEX]5^2[/TEX]-1)([TEX]5^2[/TEX]+1)([TEX]5^4[/TEX]+1)([TEX]5^8[/TEX]+1)([TEX]5^{16}[/TEX]+1)
=([TEX]5^4[/TEX]-1)([TEX]5^4[/TEX]+1)([TEX]5^8[/TEX]+1)([TEX]5^{16}[/TEX]+1)
=([TEX]5^8[/TEX]-1)([TEX]5^8[/TEX]+1)([TEX]5^{16}[/TEX]+1)
=([TEX]5^16[/TEX]-1)([TEX]5^{16}[/TEX]+1)
=[TEX]5^{32}[/TEX]-1
\Rightarrow P=[tex]\frac{5^{16}-1}{2}[/tex]
 
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