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这道计算题怎么简算? 9.81×0.1+0.5×98.1+0.049×981
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9.81×0.1+0.5×98.1+0.049×981
=981×0.001+0.05×981+0.049×981
=981×(0.001+0.05+0.049)
=981×0.1
=98.1
=981×0.001+0.05×981+0.049×981
=981×(0.001+0.05+0.049)
=981×0.1
=98.1
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