Warning: array_combine(): Both parameters should have at least 1 element in /www/wwwroot/wd.haodianxin.cn/wd.php on line 122
Warning: Invalid argument supplied for foreach() in /www/wwwroot/wd.haodianxin.cn/wd.php on line 129
Warning: Missing argument 2 for mc_save(), called in /www/wwwroot/wd.haodianxin.cn/wd.php on line 154 and defined in /www/wwwroot/wd.haodianxin.cn/wd.php on line 46
<R, ,·>是什么类型的环,是整环还是除环,有什么区别吗?这个代数系统表 ..._1 - 问答