大师作文网求证N=5^2*2^2n+1*2^n-3^n*3^n*6^n+1能被13整除
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求证N=5^2*2^2n+1*2^n-3^n*3^n*6^n+1能被13整除
证明：
5^2×3^(2n+1)×2^n-3^n×6^(n+2)
=5^2×3^(2n+1)×2^n-3^n×(2×3)^(n+2)
=5^2×3^(2n+1)×2^n-3^n×2^(n+2)×3^(n+2)
=5^2×3^(2n+1)×2^n-3^(2n+2)×2^(n+2)
=5^2×3^(2n+1)×2^n-3^(2n+1)×3×2^n×2^2
=3^(2n+1)×2^n×[5^2-3×2^2]
=3^(2n+1)×2^n×[25-12]
=3^(2n+1)×2^n×13
5^2×3^(2n+1)×2^n-3^n×6^(n+2)
=5^2×3^(2n+1)×2^n-3^n×(2×3)^(n+2)
=5^2×3^(2n+1)×2^n-3^n×2^(n+2)×3^(n+2)
=5^2×3^(2n+1)×2^n-3^(2n+2)×2^(n+2)
=5^2×3^(2n+1)×2^n-3^(2n+1)×3×2^n×2^2
=3^(2n+1)×2^n×[5^2-3×2^2]
=3^(2n+1)×2^n×[25-12]
=3^(2n+1)×2^n×13
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试说明:5^2·3^2n+1·2^n-6^n·3^n·6^n能被13整除.