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9.9*0.81简便方法计算
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9.9*0.81简便方法计算
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9.9*0.81
=（10-0.1）×0.81
=10×0.81-0.1×0.81
=8.1-0.081
=8.019
=（10-0.1）×0.81
=10×0.81-0.1×0.81
=8.1-0.081
=8.019
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