Toán nâng cao

V

vinhdoraemon

Ta có : ( [TEX]n^2[/TEX] + n ) = n ( n + 1 )
\Rightarrow n ( n + 1 ) chia hết cho [TEX]n^2[/TEX] + 1
\Rightarrow [TEX]n^2[/TEX] + 1 chia hết cho [TEX]n^2[/TEX] + 1
\Rightarrow n = 1
 
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