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