计算：小题1:（1）；小题2:（2）．-八年级数学

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• 探究题：先观察下列等式，再回答问题①；②；③；④小题1:你判断完以上各题之后，发现了什么规律？请用含有n的式子将规律表示出来，并注明n的取值范围小题2:请用数学知识说明你所写-九年级数学