（本题4分）计算:-九年级数学

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• 计算：．-九年级数学
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• 已知：y=,则＝．-九年级数学
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• 若是实数，，则-八年级数学
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• 计算：▲．-八年级数学
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• (本题5分)计算：-九年级数学
• 计算：=▲．-八年级数学