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中考选择题最后一题专题训练

中考选择题压轴题专题训练

12. 如图，正方形ABCD 的边BC 在x 轴的负半轴上，其中E 是CD 的中点，函数x

y =

的图象经过点A 、E ，若B 点的坐标是()3,0-，则k 的值为（） A. 5- B. 4- C. 6- D. 9-

12．如图，一次函数b x y +=的图象与x 轴交于点A ，与y 轴交于点B ，与反比例函数

) A ．2

12=?B

C D S A ．3 12.AOD S D A ．C ．

12． A ．4 B ．6 C ．－8 D ．8

12．如图，在ABC Rt ?中，?=∠90ABC ，点B 在x 轴上，且()01，-B ，A 点的横坐标是2，AB=3BC ，双曲线()04＞m x m

y =

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A ．12

B ．9

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D ．3

12.如图，点A 在双曲线1y x =

上，点B 在双曲线3

y x

=上，且AB x ∥轴，点C 和点D 在x 轴上，若四边形ABCD 为矩形，则矩形ABCD 的面积为( )

A .1

B .2

C .3

D .-2

轴的正半轴上，

点

12y =

OB A ． B ． C ． D ．

12．如图，反比例函数x

y =

的图像经过矩形AOBC 的边AC 的中点E ，与另一边BC 交于点D ，连接DE ，若2=?ECD S ，则k 的值为（） A ．2 B ．4 C ．8 D ．16

第12题图 x 12题

第12题图

12题图

12．如图，点),3(m A 在双曲线x

y 3

上，过点A 作AC ⊥x 轴于点C ，线段OA 的垂直平分线交OC 于点B ，则△ABO 的面积为（ ▲ ）

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