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78x72怎样巧算

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72x78怎么巧算

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101×79-79巧算

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79乘以71巧算

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79x71怎么巧算

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77乘78巧算

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79×79-79+22×79巧算

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78x72怎样巧算

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72x78怎么巧算

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101×79-79巧算

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7x17x27x37巧算

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71除9乘72巧算

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