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1. 如图,矩形 ABCD 中, AD=3cm , AB=acm(a>3). 动点 M 、 N 同时从 B 点出发,分别沿 B→A , B → C 运动,速度是 1 厘米 / 秒 . 过 M 作直线垂直于 AB ,分别交 AN 、 CD 于 P 、 Q ,当点 N 到达终点 C 时,点 M 也随之停止运动 . 设运动时间为 t 秒 . (1) 若 a=4cm , t=1 秒,则 PM=______cm (2) 若 a=5cm ,求时间 t ,使△ PNB∽△PAD ,并求出它们的相似比;

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24870

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  1. 1.如图,矩形ABCD中,AD=3cm,AB=acm(a>3).动点M、N同时从B点出发,分别沿B→A,B →C运动,速度是1厘米/秒.过M作直线垂直于AB,分别交AN、CD于P、Q,当点N到达终点C时,点M也随之停止运动.设运动时间为t秒. (1)若a=4cm,t=1秒,则PM=______cm (2)若a=5cm,求时间t,使△PNB∽△PAD,并求出它们的相似比; (3)若在运动过程中,存在某时刻使梯形PMBN与梯形PQDA面积相等,求a的取值范围; (4)是否存在这样的矩形:在运动过程中,存在某时刻使梯形PMBN、梯形PQDA、梯形PQCN的面积都相等?若存在,求a的值;若不存在,请说明理由. D Q D Q C C P N P N A B A M B M

  2. 2.如图在四边形ABCD中,∠B=90°AD ∥BC,AB=4,BC=12,点E在BA的延长线上,AE=2,点F在BC边上,EF与边AD相交于点G,DF⊥EF,设AG=x,DF=y. (1)求y关于x的函数解析式,并写出定义域; (2)当AD=11时,求AG的长. E G D A B C F

  3. 3.如图,已知在梯形ABCD中,AD∥BC,AB=CD=5, ,AH⊥BC于H,AH=4,P是BC上的一个动点,∠APQ= ∠B,PQ交射线AD于点Q.设点P到点B的距离为x,点Q到点D的距离为y. (1)用含x的代数式表示AP的长; (2)求y关于x的函数解析式,并写出它的定义域; (3)△CPQ与△ABP能否相似?如果能,请求出BP的长;如果不能,请说明理由. A D Q B P C H

  4. 4.已知边长为3的等边△ABC,点F在BC边上,CF=1,点E是射线BA上一动点,以线段EF为边向右侧作等边△EFG,直线EG、FG交直线AC于点M、N,4.已知边长为3的等边△ABC,点F在BC边上,CF=1,点E是射线BA上一动点,以线段EF为边向右侧作等边△EFG,直线EG、FG交直线AC于点M、N, (1)写出图中与△BEF相似的三角形; (2)证明其中一对三角形相似; (3)设BE=x,MN=y,求y与x之间的函数解析式,并写出定域; (4)若AE=1,试求△GMN的面积. M N E A A A M E M G G G N E N B C F B C B C F F

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