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 f(x)在R上可导,2f(x)+x f&#39;(x)〉x方,则 A f(x)〉0 B f(x )〈0 C f - 问答

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f(x)在R上可导,2f(x)+x f&#39;(x)〉x方,则 A f(x)〉0 B f(x )〈0 C f

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