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• 先化简，再求值：，其中．-八年级数学
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• 已知P=a2+b2a2-b2，Q=2aba2-b2，用“+”或“-”连接P，Q共有三种不同的形式：P+Q，P-Q，Q-P，请选择其中一种进行化简求值，其中a=3，b=2．-数学
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• 化简的结果为（）。-八年级数学
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