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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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在下述等式之间只添加加号或减号，使之成立 …
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花店老板用玫瑰、康乃馨和菊花做花束。 …
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请你迅速找出这样一个10位数字，其中第一 …
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你只能使用任何字母一次，你能用英文写下的 …
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