1、2022 全程班高分必刷 800 题答案解析新浪微博考研数学周洋鑫12022 年全程班高分必刷 800 题作业答案第二章 一元函数微分学【105】解析：232yxaxb62yxa111yab 120yba 解得3,3ab【106】解析：2224334122 14144111xxxxxxxxyxxx326444 143 14 11248111xxxxxxyxxx令102yx 得102xy 时，102xy 时，故拐点为1 2,2 9【107】解析：ln 11 ln 11limlimlim11xxxxxexxeyaxxxx x1 ln 1111 ln 111limlimlim212121xxxxxx
2、xxxeeexxeeexxx1111lim12222xxxeelimlimln 1limln111xxxxxxxxby axexeexxxlimln 1limln 111xxxxxxxexexxlimlim ln 11 011xxxxex 故斜渐近线为1yx2022 全程班高分必刷 800 题答案解析新浪微博考研数学周洋鑫2limlimln 1limlim ln 11 0111xxxxxxxxyeexx 故在 X 轴左侧有水平渐近线，无斜渐近线【108】解析：22111 0limlim111 01xxxxeeyee故有水平渐近线1y 220012limlim01xxxxeye 故有垂直渐近线0
3、 x 选 D【109】解析：222222arctan 1arctan 1limlimlimlim1 0111xxxxxxyxxaxxxxx 322232221+arctan 1+1+limlimarctan 1+lim11xxxxxxxxxbyaxxxxx 222222222 arctan 1+1+11+arctan 1+11+limlim12xxxxxxxxxxxx222211limarctan 1limlim0022211xxxxxxx故斜渐近线为2yx【110】解析：arctanarctanarctanarctan222222211111111xxxxx xxyexeeexxx则 arc
4、tan124122yxyee 极大值 20yxye 极小值arctan211limlim1xxxyxaeeexx arctanarctanarctan2221limlim1limlimxxxxxxxbye xxee xx eeearctanarctan22lim1limxxxxe x eearctan2limarctanlim2xxxe xxe2022 全程班高分必刷 800 题答案解析新浪微博考研数学周洋鑫322100111111limarctanlim21xttttteeeett 令201lim21teeet 故 X 轴右侧斜渐近线为2ye xearctan22221limlim11xxxyxaeexx arctanarctanarctan2222limlim1lim1xxxxxxbyxxexx eearctanarctanarctan222lim1limlimarctanlim2xxxxxxxx eexxe22122200011111arctan12limlim1lim1211xtttttttett 令故在 X 轴左侧的斜渐近线为2yx【111】解析：3322222|21,1 1021112yxyyx 则点的坐标为1,0
