如图,在Rt△ABC中,∠C=90°,AC=BC=4cm,点D为AC边上一点,且AD=3cm,动...

发布网友发布时间：2024-01-20 06:50

共2个回答

热心网友时间：2024-03-04 20:27

解：（1）∵∠C=90°，AC=BC，
∴∠A=∠B=45°，
∵DE⊥AB，
∴∠DEA=90°，
∵AD=3，
由勾股定理得：AE=322，
故答案为：322．

（2）∵在△ABC中，∠C=90°，AC=BC=4．
∴∠A=∠B=45°，
AB=42，
∴∠ADE+∠AED=135°，
又∵∠DEF=45°，
∴∠BEF+∠AED=135°，
∴∠ADE=∠BEF，
∴△ADE∽△BEF，
∴ADBE=AEBF，
∴342?x=xy，
∴y=-13x2+432x，
∴y=-13x2+43已赞过已踩过你对这个回答的评价是？评论收起 // 高质or满意or特型or推荐答案打点时间 window.iPerformance && window.iPerformance.mark('c_best', +new Date); F.context('answers')['3113508795'] = {uid:"3534829275",imId:"public.1.98c6260a.yOcNHuW7Ybl7LXORs1lu1g",id:"3113508795",userName:"天Z行空",userNameEnc:"%E5%A4%A9Z%E8%A1%8C%E7%A9%BA",user:{sex:"1",iconType:"6",gradeIndex:"1",grAnswerNum:"0",isAuth:"0",authTitle:"",isUserAdmin:"0",userAdminLevel:"",userAdminTitle:"",userAdminType:"",isFamous:"0",isMaster:"0"},isAnonymous:"0",isCurrentUser:"0",mapUrl:"",refer:"",replyAskNum:"",threadId:"12454035181",hasComment:"0",qid:"584287600419333845",raid:"",recommendCanceled:"0"}; F.context('answers')['3113508795']['c_timestamp'] = '1573209342'; F.context('answers')['3113508795'].encodeUid = 'db364069236f25705e79b1d2'; F.context('answers')['3113508795'].ext_pack = {"dynamic_stick_bonus":"0","from_feedback":"1","mode_begintime":"0","mode_qtype":"0","op_uid":"0","partner":[],"reply_entry":"qb_qb_none"}; F.context('answers')['3113508795'].bit_pack = {"is_recommend":"0","wap_flag":"0","is_pic_contained":"0","media_flag":"0","help_flag":"0","anonymous":"0","is_really_anonymous":"0","level_new":"1","comment_flag":"0","in_mis":"0","auto_recommend":"0","content_rich_flag":"0","prior_flag":"0","hidden_flag":"0","rec_canceled_flag":"0","mis_flag":"0","file_flag":"0","read_flag":"0","is_challenge":"0","ikaudio_flag":"0","mavin_flag":"0","is_delete_lock":"0","authentic_state":"0","is_compulsory_best":"0","dynamic_stick_flag":"0","video_flag":"0","vote_affirmative":"0","vote_negative":"0","is_video":"0","is_baiduyun":"0","is_yike_card":"0","is_baidumap":"0","is_note":"0"}; 百度网友25a0995
2019-11-08知道答主回答量：0采纳率：0%帮助的人：0我也去答题访问个人页关注展开全部现做EC的辅助线，然后你就会发现并没有什么卵用已赞过已踩过你对这个回答的评价是？评论收起收起1条折叠回答推荐律师服务：若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询其他类似问题2015-02-05如图，在Rt△ABC中，∠ACB=90°，AC=8cm，BC...352015-02-04（12分）如图，在Rt△ABC中，∠C=90°，AC=BC=...12015-02-10如图，在△ABC中，AC=BC，∠ACB=90°，点D为△A...152015-02-10（2014?重庆）如图，在△ABC中，∠ACB=90°，AC...212015-02-10如图，在Rt△ABC中，∠ACB=90°，AC=BC，D为B...42013-05-29如图在RT三角形ABC中角C=90度AC=BC=4以点D为A...372015-02-10如图，在Rt△ABC中，∠ABC=90°，AB=8，BC=6...222017-01-17如图，△ABC中，∠C = 30°，AC =4 cm ，点D...更多类似问题 >为你推荐：特别推荐 F.context('cmsRight', [ { 'url':'https://m.eic.org.cn/special/eic_studyabroad_preparation_bd_m/?account=&medium=lx_m_baidu_zstt_ocpc&campaign=&content=&kwd=', 'src':'https://iknow-pic.cdn.bcebos.com/c83d70cf3bc79f3d77b7f1aca8a1cd11738b29d3?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_450%2Ch_600%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto' }, { 'url':'https://baijiahao.baidu.com/builder/bjh-activity/ArticlesTask?taskId=1596886&aside=0&from=1', 'src':'https://iknow-pic.cdn.bcebos.com/42a98226cffc1e1731888dad5890f603738de973?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_450%2Ch_600%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto' } ]); 癌症的治疗费用为何越来越高？什么是“网络厕所”？会造成什么影响？电动车多次降价，品质是否有保障？华强北的二手手机是否靠谱？百度律临—免费法律服务推荐超3w专业律师，24H在线服务，平均3分钟回复免费预约随时在线律师指导专业律师一对一沟通完美完成等你来答换一换帮助更多人下载百度知道APP，抢鲜体验使用百度知道APP，立即抢鲜体验。你的手机镜头里或许有别人想知道的答案。扫描二维码下载×个人、企业类侵权投诉违法有害信息,请在下方选择后提交

类别

色情低俗涉嫌违法犯罪时政信息不实垃圾广告低质灌水

我们会通过消息、邮箱等方式尽快将举报结果通知您。

说明

0/200

提交取消领取奖励

我的财富值

兑换商品

去登录

我的现金

提现

下载百度知道APP
在APP端-任务中心提现

我知道了

去登录做任务开宝箱

累计完成

个任务

10任务

略略略略…

50任务

略略略略…

100任务

略略略略…

200任务

略略略略…

任务列表加载中...新手帮助如何答题获取采纳使用财富值玩法介绍知道商城帮帮团合伙人认证

您的账号状态正常

感谢您对我们的支持

投诉建议意见反馈账号申诉非法信息举报

辅助

模式

void function(a,b,c,d,e,f){function g(b){a.attachEvent?a.attachEvent("onload",b,!1):a.addEventListener&&a.addEventListener("load",b)}function h(a,c,d){d=d||15;var e=new Date;e.setTime((new Date).getTime()+1e3*d),b.cookie=a+"="+escape(c)+";path=/;expires="+e.toGMTString()}function i(a){var c=b.cookie.match(new RegExp("(^| )"+a+"=([^;]*)(;|$)"));return null!=c?unescape(c[2]):null}function j(){var a=i("PMS_JT");if(a){h("PMS_JT","",-1);try{a=a.match(/{["']s["']:(\d+),["']r["']:["']([\s\S]+)["']}/),a=a&&a[1]&&a[2]?{s:parseInt(a[1]),r:a[2]}:{}}catch(c){a={}}a.r&&b.referrer.replace(/#.*/,"")!=a.r||alog("speed.set","wt",a.s)}}if(a.alogObjectConfig){var k=a.alogObjectConfig.sample,l=a.alogObjectConfig.rand;d="https:"===a.location.protocol?"https://fex.bdstatic.com"+d:"http://fex.bdstatic.com"+d,k&&l&&l>k||(g(function(){alog("speed.set","lt",+new Date),e=b.createElement(c),e.async=!0,e.src=d+"?v="+~(new Date/864e5)+~(new Date/864e5),f=b.getElementsByTagName(c)[0],f.parentNode.insertBefore(e,f)}),j())}}(window,document,"script","/hunter/alog/dp.min.js"); var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?6859ce5aaf00fb00387e6434e4fcc925"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); window.tt = 1709555437;

热心网友时间：2024-03-04 20:26

现做EC的辅助线，然后你就会发现并没有什么卵用