如图,梯形ABCD中AB∥CD,∠DAB=90°,AB=4CD,E是腰BC上一点,CE=CD,过点E作EF⊥BC交AD于点F,若F是AD的中点,则下列结论: ①AE⊥DE;②AB=AD;③tan∠EFD= 4 3 ;④S△ABE=16S△CDE; 其中正确结论的个数是( ) A、4个B、3个C、2个D、1个 ...
如图.已知正方形ABCD的边长为4.点E.F分别在边AB.BC上.且AE=BF=1.CE.DF交于点O.下列结论:①∠DOC=90°.②OC=OE.③tan∠OCD=43.④S△ODC=S四边形BEOF中.正确的有( )A.1个B.2个C.3个D.4个
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鲨客SNC-E2Max、SNC-E2T1、SNC-ES1型吸水式吸尘器(智能洗地机)有双刮条防缠绕,刮污同时解决毛发缠绕难题,平直刮条每分钟刮污高达500次,防缠尺梳99.99%不缠绕。 Shark鲨客牌SNC-E2Max、SNC-E2T1、SNC-ES1型吸水式吸尘器(...
如图.在直角梯形ABCD中.AD∥BC.∠B=90°.AB=8cm.AD=24cm.BC=26cm.AB为⊙O的直径.动点P从点A开始沿AD边向点D以1cm/s的速度运动.动点Q从点C开始沿CB边向点B以3cm/s的速度运动.P.Q两点同时出发.当其中一点到达端点时.另一点也随之停止运动.设运动时间为t.求:(1)t分别为何值时
已知:在Rt三角形ABC中,角C=90度,角A、角B、角C的对边分别为a、b、c,设三角形BC的面积为S,周长为l,如果a+b-c=m,当a+b-c=2时,s/l=1/2;当a+b-c=4时,s/l=1;当a+b-c=6时,s/l=1.5;观察上表猜想s/l=?,请证明. 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报...
3、极限<img src="https://static.zxtiku.com/wangke/imgs/topic/e889159e46b86dde9f43c494adbe09f2.jpg"/>=( )<br/> A、0<br/> B、无穷大<br/> C、1<br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/5a68629224add89db810100e87bc37c9.jpg"/>
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<img src="https://static.zxtiku.com/wangke/imgs/topic/e2dbdee7c326b9bc78234db1f33562e4.jpg"/><br/> 则<img src="https://static.zxtiku.com/wangke/imgs/topic/8bf32be1e8c1f90dcfba00cc35a7b7e5.jpg"/>是<img src="https://static.zxtiku.com/wangke/imgs/topic/6890