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 已知:如上图,△ABC中,CD垂直于AB于D,AC=4,BC=3,DB=9/5。(1)求DC的长..._7 - 问答
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已知:如上图,△ABC中,CD垂直于AB于D,AC=4,BC=3,DB=9/5。(1)求DC的长...

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