12346+12345

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12346+12345
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12346+12345
12346+12345

12346+12345
=24691

24691

12346+12345
=12345+1+12345
=2*12345+1
=24690+1
=24691

24691

24691

12345*12345-12344*12346 =12345 -(12345-1)*(12345 1) =12345 -12345 1 =1 =12345*12345-(12345-1)*(12345 1) =12345*12345-(12345*