A、级数<img id=\""ODqgessTEMP20180523105806293.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODqgessTEMP20180523105806293.png?Expires=1842404286&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=BlJshLjT9Xr5niU1%2BlQ5F3Bv%2By0%3D\"" \/>收敛
B、级数<img id=\""ODwhtnlTEMP20180523105806952.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODwhtnlTEMP20180523105806952.png?Expires=1842404286&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=svrNEdFJGTOv4KZk42Jjtwo32es%3D\"" \/>未必收敛
C、级数<img id=\""ODwybqhTEMP20180523105807240.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODwybqhTEMP20180523105807240.png?Expires=1842404287&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=STuaPUoFgOKrGnQmkcgrFFbZUUA%3D\"" \/>收敛
D、级数<img id=\""ODorvleTEMP20180523105807195.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODorvleTEMP20180523105807195.png?Expires=1842404287&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=XiApfkClzHuG70wFiRzN9POOot4%3D\"" \/>,未必收敛