1.8-[1÷(0.75+1/3)]×13/8 简便 拖式
问题描述：
1.8-[1÷(0.75+1/3)]×13/8 简便 拖式
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答
1.8-[1÷(0.75+1/3)]×13/8
=1.8-[1÷13/12]×13/8
=1.8-12/13×13/8
=1.8-1.5
=0.3