A、级数<img id=\""ODikliwTEMP20180523105948878.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODikliwTEMP20180523105948878.png?Expires=1842404389&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=uBMNwdSfHBlrSPLWYbtkniFXITY%3D\"" \/>必收敛
B、级数<img id=\""ODxpsgvTEMP20180523105949188.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODxpsgvTEMP20180523105949188.png?Expires=1842404389&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=UE9YRZ1RagZUyLphLsu0xpH91u0%3D\"" \/>必发散
C、级数<img id=\""ODloyqaTEMP20180523105949508.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODloyqaTEMP20180523105949508.png?Expires=1842404389&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=pN2yoH04gKaBoJujC3C8YzMDtEE%3D\"" \/>必发散
D、级数<img id=\""ODphbpjTEMP20180523105950181.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODphbpjTEMP20180523105950181.png?Expires=1842404390&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=9TH63Hi7j2y5BqGnA86TgQFmNM8%3D\"" \/>必发散