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!

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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!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

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!
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!

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!
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

34.5×76.5-123×1.45-345×6.42
=34.5×76.5-34.5×64.2-123×1.45
=34.5×(76.5-64.2)-12.3×14.5
=34.5×12.3-12.3×14.5
=12.3×(34.5-14.5)
=12.3×20
=246

=34.5*76.5-34.5*64.2-123*1.45
=34.5*(76.5-64.2)-123*1.45
=34.5*12.3-123*1.45
=123*3.45-123*1.45
=123*(3.45-1.45)
=123*2
=246