作业帮34.5*76.5-345*6.42-123*1.45用简便方法怎算
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34.5*76.5-345*6.42-123*1.45用简便方法怎算
34.5*76.5-345*6.42-123*1.45用简便方法怎算
34.5*76.5-345*6.42-123*1.45用简便方法怎算
34.5*76.5-345*6.42-123*1.45
=34.5*76.5-64.2*34.5-12.3*14.5
=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