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0.642÷4÷0.321的简便计算方法
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0.642÷4÷0.321的简便计算方法
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答案和解析
原式
=（0.642÷2）÷0.321÷2
=（0.321÷0.321）÷2
=1÷2
=0.5
=（0.642÷2）÷0.321÷2
=（0.321÷0.321）÷2
=1÷2
=0.5
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