38.5减5.38加61.5减4.62的简便计算

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38.5减5.38加61.5减4.62的简便计算
38.5减5.38加61.5减4.62的简便计算

38.5减5.38加61.5减4.62的简便计算
38.5减5.38加61.5减4.62
=(38.5+61.5)-(5.38+4.62)
=100-10
=90

38.5-5.38+61.5-4.62=(38.5+61.5)-(5.38+4.62)=100-10=90

38.5-5.38+61.5-4.62
=(38.5+61.5)-(5.38-4.62)
=100-10
=90
用交换律与结合律,很简单的

=(38.5+61.5)-(5.38+4.62)
=100-10
=90

(38.5+61.5)-(5.38+4.62)=100-10=90
看懂吗?不明白可以继续问