34.5*76.5-123*1.45-345*6.42如何简算?
问题描述：
34.5*76.5-123*1.45-345*6.42如何简算?
如何简算?过程详细不要把重要的忽略了!
答
34.5*76.5-123*1.45-345*6.42
=345*7.65-123*1.45-345*6.42
=345*（7.65-6.42）-123*1.45
=345*1.23-123*1.45
=3.45*123-123*1.45
=123*(3.45-1.45)
=123*2
=246