立方根与平方根相等的数为______．-数学

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• 下列4种说法：①如果a存在平方根，那么a＞0；②如果a没有平方根，那么a＜0；③如果a的平方根不等于0，那么a不等于0；④a＞0时，a的平方根必大于0；其中，正确的是（）A．①②B．②③C．③④D．①
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