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*76.5-34.5*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

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*76.5-123*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