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）
人气：217 ℃ 时间：2020-06-26 16:36:12
解答
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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