0.45*78.2+20.8*0.45+0.45用简便方法计算应怎样算

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0.45*78.2+20.8*0.45+0.45用简便方法计算应怎样算

0.45*78.2+20.8*0.45+0.45用简便方法计算应怎样算
0.45*78.2+20.8*0.45+0.45用简便方法计算应怎样算

0.45*78.2+20.8*0.45+0.45用简便方法计算应怎样算
0.45*78.2+20.8*0.45+0.45
=0.45*(78.2+20.8+1)
=0.45*100
=45