(1234567891)2-1234567890×1234567892

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(1234567891)2-1234567890×1234567892(1234567891)2-1234567890×1234567892(1234567891)2-1234567890×12345

(1234567891)2-1234567890×1234567892
(1234567891)2-1234567890×1234567892

(1234567891)2-1234567890×1234567892
(1234567891)²-1234567890×1234567892
=1234567891²-(1234567891-1)×(1234567891+1)
=1234567891²-(1234567891²-1)
=1234567891²-1234567891²+1
=1