用简便方法计算:9.75+99.75+999.75+9999.75=

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用简便方法计算:9.75+99.75+999.75+9999.75=

用简便方法计算:9.75+99.75+999.75+9999.75=
用简便方法计算:9.75+99.75+999.75+9999.75=

用简便方法计算:9.75+99.75+999.75+9999.75=
9.75+99.75+999.75+9999.75
=0.75×4+10-1+100-1+1000-1+10000-1
=11109