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2.1÷56竖式

采纳

详细步骤写在纸上了

3.75

1÷2.56=0.39

2.1÷0.56=3.75 验算: 4.2×3.2=13.44 验算:

2.1÷0.2除法列竖式 2.1/ 0.2 = 21/2 = 10.5

2.1÷28=0.075

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