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高中数学1加1/n平方加1/n4方加1/n6方+
+一直加下去等于多少
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当1/n²＜1即n＞1或n＜-1时原式=1/(1-1/n²)=n²/(n²-1)当1/n²≥1即0＜n≤1或0＞n≥-1时原式=正无穷
n大于o时 原式为n2/n2-1怎么来的
我刚进高中
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学数列没？首项是1。公比是1／n2...求数列和
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