123454321/12345*12345-12346*12344=

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123454321/12345*12345-12346*12344=123454321/12345*12345-12346*12344=123454321/12345*12345-12346*1234

123454321/12345*12345-12346*12344=
123454321/12345*12345-12346*12344=

123454321/12345*12345-12346*12344=
123454321/(12345*12345-12346*12344)
=123454321/【12345*12345-(12345+1)*(12345-1)】
=123454321/(12345*12345-12345*12345+1)
=123454321/1
=123454321

12346*12344=(12345+1)*(12345-1)=12345*12345-1
123154321/(12345*12345-12346*12344)=123154321