计算：2﹣3=（）-七年级数学

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• （﹣2）0=（），=（），（﹣3）﹣1=（）．-七年级数学
• 己知，则n的值是[]A．0B．1C．﹣1D．n的值不存在-七年级数学
• 计算：（）﹣2=（）．-七年级数学
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• =﹙﹚．-七年级数学
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• 计算：4﹣2=（）-七年级数学
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