计算：（1）27-212+45（2）5242-323-数学

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• I'm sure I ___in a certain key university at this time next year．A．am studyingB．will have studi
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• 计算32-3(22-18)的结果为（）A．72B．22C．2D．3-数学
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• 计算：4x-x=______．-数学
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