的相反数是．-八年级数学

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• (8分)观察下列各式及验证过程：.验证:.验证:.验证:（1）按照上述三个等式及其验证过程的基本思路，猜想的变形结果并进行验证；（2）针对上述各式反映的规律，写出用n（n的自然数-八年级数学
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• ②-九年级数学
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• 化简：=；=．-八年级数学
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