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计算 （0.1+0.12+0.123+0.1234）×（0.12+0.123+0.1234+0.12345）-（0.1+0.12+0.123+0.1234+0.12345）×（0.12+0.123+0.1234）

分类: 作业答案 • 2021-12-03 11:53:49
问题描述：

计算
（0.1+0.12+0.123+0.1234）×（0.12+0.123+0.1234+0.12345）-（0.1+0.12+0.123+0.1234+0.12345）×（0.12+0.123+0.1234）

答

设（0.1+0.12+0.123+0.1234）=A，（0.12+0.123+0.1234）=B，则A-B=0.1，（0.1+0.12+0.123+0.1234）×（0.12+0.123+0.1234+0.12345）-（0.1+0.12+0.123+0.1234+0.12345）×（0.12+0.123+0.1234）=A×（B+0.12345）-（...

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