It’s only six o’clock now; Little Tom should be up ,though, because he _____ for nine hours.A．has be

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• 化简：（）。-九年级数学
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• 化简：=（）。-九年级数学
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• 化简：（）。-九年级数学
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• 计算：（1）；（2）。-八年级数学
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• 化简：。-九年级数学
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• 计算：。-九年级数学
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