原式=（2001*0.1+2001*0.01+2001*0.001+2001*0.0001）÷0.1111
=2001*（0.1+0.01+0.001+0.0001）÷0.1111
=2001*0.1111÷0.1111
=2001*（0.1111÷0.1111）
=2001
(200.1+20.01+2.001+0.2001)÷0.1111计算法
2个回答
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