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Warning: fclose() expects parameter 1 to be resource, bool given in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2475 请问如果给出一个第二类曲线积分∫p()dx+q()dy, 并且知道与路径无关,给出起点(0,0)和终点(3,1),怎么求 - 66问答网