2.1×0.5÷4.2 1＋0.45÷0.9－0. - 知识问答

2.1×0.5÷4.2 1＋0.45÷0.9－0.75（怎么简便怎样算）

4个回答

2.1×0.5÷4.2
=2.1÷4.2 ×0.5
=0.5×0.5
=0.25
1＋0.45÷0.9－0.75
=1＋0.5－0.75
=1.5-0.75
=0.75

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