(0.1+0.12+0.123+0.1234)*(0.12+0.123+0.1234+0.12345)-(0.1+0.12+0.1_数学解答

(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)=

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解答

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