全网谜题首发！
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在等号左边的数字之间添加上适当的运算符号 …
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如果至少有一部分A不是B，有的B是C，那 …
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如果至少有一部分A不是B，有的A是C，那 …
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在下述等式之间只添加加号或减号，使之成立 …
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