5436×5438-5435×5439
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5436×5438-5435×5439
5436×5438-5435×5439
5436×5438-5435×5439
5436*5438-5435*5439
=(5435+1)*5438-5435*(5438+1)=5435*5438+5438-5435*5438-5435
=5438-5435
=3
(5437-1)(5437+1)-(5437-2)(5437+2)=5437^2-1-5437^2+4=3
5436×5438-5435×5439
=5436×5438-(5436-1)×(5438+1)
=5436×5438-(5436×5438-5438+5436-1)
=5436×5438-5436×5438+5438-5436+1
=5438-5436+1
=2+1
=3
5436×5438-5435×5439
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