已知M（a，b）由 确定的平面区域内，N（a+b，a-b）所在平面区域的面积为

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='32858' and id < 2619134 and id<>'2619134' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='32858' and id > 2619134 and id<>'2619134' order by id asc limit 5