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60×54怎么验算?

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208×3怎么验算

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90÷5怎么验算?

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47÷9怎么验算?

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305×25怎么验算?

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27×15怎么验算?

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84÷4怎么验算?

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619÷75怎么验算?

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420×60怎么验算?

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