计算：18-8-2=______．-数学

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• 计算：18+2=______．-数学
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• 计算8-2的结果是（）A．6B．6C．2D．2-数学
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• 已知：m，n是两个连续自然数（m＜n），且q=mn．设p=q+n+q-m，则p（）A．总是奇数B．总是偶数C．有时是奇数，有时是偶数D．有时是有理数，有时是无理数-数学
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