用简便方法计算原题,44.5+28+44.5×420+4.45×30

来源：学生作业帮助网编辑：作业帮时间：2024/11/15 06:34:25

用简便方法计算原题,44.5+28+44.5×420+4.45×30
用简便方法计算原题,44.5+28+44.5×420+4.45×30

用简便方法计算原题,44.5+28+44.5×420+4.45×30
=44.5x（30+420+30）-44.5x2
=44.5x480-89
=2047

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用简便方法计算 原题,44.5+28+44.5×420+4.45×30

用简便方法计算原题,44.5+28+44.5×420+4.45×30