12346²-12345*12347=

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12346²-12345*12347=12346²-12345*12347=12346²-12345*12347=a^2-(a-1)(a+1)=a^2-(a^2-1)=1

12346²-12345*12347=
12346²-12345*12347=

12346²-12345*12347=
a^2-(a-1)(a+1)=a^2-(a^2-1)=1

1