用一根绳子绕柱孑2圈则绳子多40厘米,如果绕柱子3圈则绳子少20厘米,这根绳子有多长

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用一根绳子绕柱孑2圈则绳子多40厘米,如果绕柱子3圈则绳子少20厘米,这根绳子有多长
用一根绳子绕柱孑2圈则绳子多40厘米,如果绕柱子3圈则绳子少20厘米,这根绳子有多长

用一根绳子绕柱孑2圈则绳子多40厘米,如果绕柱子3圈则绳子少20厘米,这根绳子有多长
16Ocm

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Fatal error: Uncaught Error: Call to undefined method pdo_mysql::sqlError() in /mnt/www/zhanqunzuoye/library/mysql/pdo_mysql.php:106 Stack trace: #0 /mnt/www/zhanqunzuoye/library/mysql/pdo_mysql.php(61): pdo_mysql->getPDOError('select id,keyna...') #1 /mnt/www/zhanqunzuoye/library/mysql/pdo_mysql.php(80): pdo_mysql->_fetch('select id,keyna...', 1) #2 /mnt/www/zhanqunzuoye/library/mysql/pdo_mysql.php(179): pdo_mysql->getAll('select id,keyna...') #3 /mnt/www/zhanqunzuoye/library/mysql/mtable.php(47): pdo_mysql->getAllPdo('select id,keyna...', NULL) #4 /mnt/www/zhanqunzuoye/control/public/indexControl.php(29): mtable->getIndexDesc(10, Array) #5 /mnt/www/zhanqunzuoye/library/core/core.php(84): indexControl->topfocusAction() #6 /mnt/www/zhanqunzuoye/library/core/control.php(45): core::gotoAction(Array) #7 /mnt/www/zhanqunzuoye/view/public/index/zuoye.php(23): control->action('topfocus', 'index') #8 /mnt/www/zhanqunzuoye/library/core/control.php(24): require('/mnt/www/zhanqu...') #9 /mnt/www/zhanqunzuoye/control/public/indexCon in /mnt/www/zhanqunzuoye/library/mysql/pdo_mysql.php on line 106