1234567891x1234567891-1234567890x1234567892二?
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1234567891x1234567891-1234567890x1234567892
=1234567891x1234567891-(1234567891-1)(1234567891+1)
=1234567891x1234567891-(1234567891x12345678912-1)
=1234567891x1234567891-1234567891x12345678912+1
=0+1
=1
=1234567891x1234567891-(1234567891-1)(1234567891+1)
=1234567891x1234567891-(1234567891x12345678912-1)
=1234567891x1234567891-1234567891x12345678912+1
=0+1
=1
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