“12345679乘12345677/12345678”是多少?

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“12345679乘12345677/12345678”是多少?

(12345678+1)*12345677/12345678
=12345677+12345677/12345678

12345679乘12345677/12345678
=(12345678+1)(12345678-1)/12345678
=12345678-1/12345678