12345*12348-12346*12346
问题描述：
12345*12348-12346*12346
答
12345*12348-12346*12346
=12345*12348-12346*(12345+1)
=12345*12348-12346*12345-12346*1
=12345*(12348-12346)-12346
=12345*2-12345-1
=12345-1
=12344