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霞栖影

新虫 (小有名气)

引用回帖:
5楼: Originally posted by peterflyer at 2016-02-25 16:07:48
第二题:
A和B肯定不对,因为g(x)-φ(x)有极限不一定意味着g(x)或φ(x)有极限,比如:g(x)=lnx,φ(x)=Ln(x+6) ,虽然Lim{g(x)-φ(x),x-->∞}=0,但g(x)和φ(x)均无极限。C也太绝对了,也不对,比如:g(x)=ln(1 ...

是n趋向于无穷,不是x

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11楼2016-02-26 10:29:42
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peterflyer

木虫之王 (文学泰斗)

peterflyer


引用回帖:
11楼: Originally posted by 霞栖影 at 2016-02-26 10:29:42
是n趋向于无穷,不是x
...

道理是相似的,可令x=n即可。
12楼2016-02-26 13:58:37
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霞栖影

新虫 (小有名气)

引用回帖:
12楼: Originally posted by peterflyer at 2016-02-26 13:58:37
道理是相似的,可令x=n即可。...

里面应该既有x又有n

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13楼2016-02-26 18:27:15
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