1234567891*1234567891-1234567890*1234567892=?

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1234567891*1234567891-1234567890*1234567892=?
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1234567891*1234567891-1234567890*1234567892=?
1234567891*1234567891-1234567890*1234567892=?

1234567891*1234567891-1234567890*1234567892=?

1234567891*1234567891-1234567890*1234567892
=1234567891²-(1234567891-1)(1234567891+1)
=1234567891²-1234567891²+1
=1

设1234567891=x,
则式子转化为x*x-(x-1)*(x+1)=1

设n=1234567891
则原式 n^2-(n-1)*(n+1)=n^2-(n^2-1)=1

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