...AB⊥BC,且AD=DC=4,BC=6,点M从A开始,以每秒1个单位的速度向D运动...
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发布时间:2024-10-05 04:19
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时间:2024-10-22 11:40
agzdfsg hhhhhhhhhhhhhhhhhss ddddddddddddddggggggg gggggggggdddd hjgvvvvvvvvvvvvvvvvvvg gddx g hj k nc v d hgfhdf djk f hh fdhzjghsguitwoiqihnoidegsj ieowurhgbi ojKlcdlm
热心网友
时间:2024-10-22 11:38
(1)如图1,作DE⊥BC于E,
∴∠DEB=∠DEC=90°.
∵AB⊥BC,
∴∠B=90°.
∵AD∥BC,
∴∠DAB+∠ABC=180°,
∴∠DAB=90°.
∴四边形ABED是矩形.
∴AD∥BE,AD=BE,AB=ED.
∵AD=4,
∴BE=4,
∴EC=2.
在Rt△DEC中,由勾股定理,得
DE=23.
∴AB=23,
∴tan∠ACB=ABBC=236=33.
如图2,∵BQ=CN=t,
∴CQ=6-t,
∴PQ6?t=33,
∴PQ=3(6?t)3.
∴S=已赞过已踩过你对这个回答的评价是?评论收起 F.context('answers')['2013927595'] = {uid:"1586632319",imId:"public.1.5ab00c63.pBVYuz6BJRwdfB8Qums-KQ",passPhoto:"1",id:"2013927595",userName:"夕阳刻痕残",userNameEnc:"%E5%A4%95%E9%98%B3%E5%88%BB%E7%97%95%E6%AE%8B",user:{sex:"1",iconType:"6",gradeIndex:"1",grAnswerNum:"0",carefield: [{cid:"171",cname:"恋爱"}],isAuth:"0",authTitle:"",isUserAdmin:"0",userAdminLevel:"",userAdminTitle:"",userAdminType:"",isFamous:"0",isMaster:"0"},isAnonymous:"0",isCurrentUser:"0",mapUrl:"",refer:"",replyAskNum:"",threadId:"8055710381",hasComment:"0",qid:"2075004210267414908",raid:"",recommendCanceled:"0"}; F.context('answers')['2013927595']['c_timestamp'] = '1424769176'; F.context('answers')['2013927595'].encodeUid = '7f164069236f25705e79925e'; F.context('answers')['2013927595'].ext_pack = {"anony_bad_value":"3","mode_begintime":"0","mode_qtype":"0","op_uid":"0","reply_entry":"qb_none_none"}; F.context('answers')['2013927595'].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":"1","prior_flag":"1","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"}; 夕阳刻痕残
2015-02-24知道答主回答量:4采纳率:0%帮助的人:4917我也去答题访问个人页关注展开全部
agzdfsg hhhhhhhhhhhhhhhhhss ddddddddddddddggggggg gggggggggdddd hjgvvvvvvvvvvvvvvvvvvg gddx g hj k nc v d hgfhdf djk f hh fdhzjghsguitwoiqihnoidegsj ieowurhgbi ojKlcdlm
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热心网友
时间:2024-10-22 11:39
agzdfsg hhhhhhhhhhhhhhhhhss ddddddddddddddggggggg gggggggggdddd hjgvvvvvvvvvvvvvvvvvvg gddx g hj k nc v d hgfhdf djk f hh fdhzjghsguitwoiqihnoidegsj ieowurhgbi ojKlcdlm
热心网友
时间:2024-10-22 11:32
(1)如图1,作DE⊥BC于E,
∴∠DEB=∠DEC=90°.
∵AB⊥BC,
∴∠B=90°.
∵AD∥BC,
∴∠DAB+∠ABC=180°,
∴∠DAB=90°.
∴四边形ABED是矩形.
∴AD∥BE,AD=BE,AB=ED.
∵AD=4,
∴BE=4,
∴EC=2.
在Rt△DEC中,由勾股定理,得
DE=23.
∴AB=23,
∴tan∠ACB=ABBC=236=33.
如图2,∵BQ=CN=t,
∴CQ=6-t,
∴PQ6?t=33,
∴PQ=3(6?t)3.
∴S=已赞过已踩过你对这个回答的评价是?评论收起 F.context('answers')['2013927595'] = {uid:"1586632319",imId:"public.1.5ab00c63.pBVYuz6BJRwdfB8Qums-KQ",passPhoto:"1",id:"2013927595",userName:"夕阳刻痕残",userNameEnc:"%E5%A4%95%E9%98%B3%E5%88%BB%E7%97%95%E6%AE%8B",user:{sex:"1",iconType:"6",gradeIndex:"1",grAnswerNum:"0",carefield: [{cid:"171",cname:"恋爱"}],isAuth:"0",authTitle:"",isUserAdmin:"0",userAdminLevel:"",userAdminTitle:"",userAdminType:"",isFamous:"0",isMaster:"0"},isAnonymous:"0",isCurrentUser:"0",mapUrl:"",refer:"",replyAskNum:"",threadId:"8055710381",hasComment:"0",qid:"2075004210267414908",raid:"",recommendCanceled:"0"}; F.context('answers')['2013927595']['c_timestamp'] = '1424769176'; F.context('answers')['2013927595'].encodeUid = '7f164069236f25705e79925e'; F.context('answers')['2013927595'].ext_pack = {"anony_bad_value":"3","mode_begintime":"0","mode_qtype":"0","op_uid":"0","reply_entry":"qb_none_none"}; F.context('answers')['2013927595'].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":"1","prior_flag":"1","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"}; 夕阳刻痕残
2015-02-24知道答主回答量:4采纳率:0%帮助的人:4917我也去答题访问个人页关注展开全部
agzdfsg hhhhhhhhhhhhhhhhhss ddddddddddddddggggggg gggggggggdddd hjgvvvvvvvvvvvvvvvvvvg gddx g hj k nc v d hgfhdf djk f hh fdhzjghsguitwoiqihnoidegsj ieowurhgbi ojKlcdlm
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