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PPPPP级数-发散上天也可emo到尘埃里
我们先看是不是n项检验可以用,就是一开始说的,如果趋于0,就不好说了,有可能收敛,那就看看是不是属于几何级数或者p级数(有判别) 如果是正项级数:基本比较和极限比较。 如果有阶乘和c^n那就比值检验,可以约一下,如果有n个次方为n的那就根值(我 ...
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