A、级数<img id=\""ODkmrfhTEMP20180523111152036.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODkmrfhTEMP20180523111152036.png?Expires=1842405112&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=fbWu%2Brg\/E\/4hAzdd83z%2Bv2VsQwE%3D\"" \/>收敛
B、级数<img id=\""ODupnxkTEMP20180523111152342.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODupnxkTEMP20180523111152342.png?Expires=1842405113&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=AEpm32lTduPF8eumrvCh0zR4sAE%3D\"" \/>未必收敛
C、级数<img id=\""ODwlnjoTEMP20180523111153035.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODwlnjoTEMP20180523111153035.png?Expires=1842405113&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=pJdKXAvCIeEZVJXKAgH97ugtNP0%3D\"" \/>收敛
D、级数<img id=\""ODvfjzgTEMP20180523111153567.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODvfjzgTEMP20180523111153567.png?Expires=1842405113&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=sNCAwwiUE4kDNM8REwD4LLUAx9o%3D\"" \/>,未必收敛