A、级数<img id=\""ODlmktyTEMP20180523110849362.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODlmktyTEMP20180523110849362.png?Expires=1842404930&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=va01gQyZw4kHRZJIDTGuiX24WwQ%3D\"" \/>必收敛
B、级数<img id=\""ODtndhhTEMP20180523110850028.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODtndhhTEMP20180523110850028.png?Expires=1842404929&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=IiWQMBvIej%2BxemV2CXnbG%2B\/YUEE%3D\"" \/>必发散
C、级数<img id=\""ODuadhiTEMP20180523110850328.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODuadhiTEMP20180523110850328.png?Expires=1842404930&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=s2vbBNRctYFyt1isp09%2B6EnxyRY%3D\"" \/>必发散
D、级数<img id=\""ODlnbniTEMP20180523110850376.png\"" src=\""http:\/\/ccm2cdn.open.com.cn\/zyglpt\/OD\/TEMP\/2018\/0523\/ODlnbniTEMP20180523110850376.png?Expires=1842404931&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=cXip6XwhGhGhCHi9JWb5gpRdcAI%3D\"" \/>必发散