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http.∥yk.wjedu.net(共9篇)
http.∥yk.wjedu.net（一）：
已知：如图,在平面直角坐标系中,点A的坐标为（0,24）,经过原点的直线 与经 过点A的直线已知：如图,在平面直角坐标系中,点A的坐标为（0,24）,经过原点的直线l1与经
过点A的直线l2相交于点B,点B坐标为（18,6）．点C为线段OB上一动点（点C不与点O,B重合）,作CD∥y轴交直线l2于点D,过点C,D分别向y轴作垂线,垂足分别为F,E．若四边形CDEF是正方形,则点C的坐标为
http://czsx.cooco.net.cn/testdetail/142132/
(1)设直线l1的表达式为y=k1x,它过B（18, 6） 得18k1=6 k1= ∴y=x
设直线l2的表达式为y=k2x+b,它过A （0, 24）, B(18, 6)得 解得 y=-x+24 （2） ①∵点C在直线l1上, 且点C的纵坐标为a,∴a=x x=3a ∴点C的坐标为 （3a, a） ∵CD∥y轴∴点D的横坐标为3a ∵点D在直线l2上 ∴y=-3a+24
∴D（3a, -3a+24） ②C（3, 1） 或C(15, 5)
http.∥yk.wjedu.net（二）：
如图a,CE//AB,所以∠1=∠2=∠B,所以∠ACD=∠1+∠2=∠A+∠B,这是一个有用的结论,请在图b的四边形ABCD中过A做AE//BC交DC于E,有这个结论,求∠A+∠B+∠C+∠D的度数.
图a
http://hiphotos.baidu.com/yalijudy/pic/item/099efed1bbb16a299a50274f.jpg
图b
http://hiphotos.baidu.com/yalijudy/pic/item/6750e5f54b044b34bd3109e2.jpg
1)三角形的一个外角等于与它不相邻的两个内角和
2)AE//BC
∠BAC+∠B=180
∠DAE+∠D=∠AEC
∠AEC+∠C=180
∠DAB+∠B+∠C+∠D
=∠DAE+∠BAE+∠B+∠C+∠D
=(∠DAE+∠D)+∠BAE+∠B+∠C
=(∠BAE+∠B)+(∠C+∠DEA)=360
http.∥yk.wjedu.net（三）：
已知：如图平行四边形ABCD中,C为DC延长线上一点,AG交BD于E,交BC于F,求证：ae^2=ef*eg【http.∥yk.wjedu.net】对比一下,这道应该是原题http://www.qiujieda.com/math/130600/以后遇到初中数理化难题都可以来这个网站搜搜寻找思路,题库超大,没有原题也有同类题,界面很科学哦,也可以来 的求求群“求解答初中学习2号群”,以后很多数理化的大牛可以帮助你,
http.∥yk.wjedu.net（四）：
初三数学题高手进（有追加!）⊙O的直径AB和弦CD垂直于E,F为DC延长线上一点,连接AF交⊙O于M,求证:∠AMD=∠FMC
http://www.yiya.net/photo/2008/11/18/normal_633626313032343750.JPG(图）
高手帮帮忙!俺班同学都做不出来
今天作业,请尽快回答,我在线等
要详细过程哦!答好有追加啊!
证明：
连接BM
因为AB是直径
所以AM⊥BM
所以∠AMB＝∠FMB＝90°
因为AB是直径,CD⊥AB
所以根据垂径定理得弧BD＝弧BC
所以∠BMD＝∠BMC
所以∠AMB－∠BMD＝∠FMB－∠BMC
所以∠AMD＝∠FMC
http.∥yk.wjedu.net（五）：
A country mouse Tommy,wants to see his new friend Timmy.Timmy is a city mouse.They know each other on the Net.They are going to meet at KFC.But Tommy doesn’t know the way.He see an old dog in the street.He says ,“You,tell me the way to the KFC!”The old dog doesn’t answer.Tommy gets angry and shouts,“Old dog,tell me the way to the KFC!Can you hear me?”The old dog looks at him and say:“Go straight ahead and take the second left,and then turn right and turn right,you will find…”
Tommy stops the old dog.He walks for half an hour.He meets the dog again.He is very angry and shouts,“Why do tell me the wrong way?”The old dog says,“Because you ask me in the wrong way.”
1.Where are Tommy and Timmy going to meet?
__________________________________________
2.Does the old dog tell Tommy the right way to the KFC?
___________________________________________
3.Can Tommy find the KFC?____________________
4.Why does the old dog tell Tommy the wrong way?
__________________________________________
5.Do you know how to ask in the right way?
__________________________________________
The zoo is an interesting place.You can see many a_______ there.Some are big and dangerous,some are s______ and cute.There is a zoo in our city.I o_____ go there.I l_____ the monkeys there.They are so f_______.
1.KFC
2.No,it doesn"t.
3.No,he can"t.
4.Because Tommy is impolite .
5.Yes.I should say :Can you tell me the way to KFC ,please
animals small often like friendly
http.∥yk.wjedu.net（六）：
成都七中学生网站是由成都七中四大学生组织共同管理的网站，该网站是成都七中历史上首次由四大学生组织共同合作建成的一个学生网站，其内容囊括了成都七中学生学习及生活的各个方面．某学生在输入网址“http： ∥ www．cdqzstu．com”中的“cdqzstu．com”时，不小心调换了两个字母的位置，则可能出现的错误种数是（ ）A．90
B．45
C．88
D．44
“cdqzstu．com”中共有10个字母；若c与后面的字母分别调换，则有：10-1=9种调换方法；
依此类推，调换方法共有：9+8+7+…+1=45种；
由于10个字母中，有两个字母相同，因此当相同字母调换时，不会出现错误．
因此出现错误的种数应该是：45-1=44种．故选D．
http.∥yk.wjedu.net（七）：
一到初二几何题,BD.CE是三角形ABC的高,点F在BD上,BF=AC,点G在CE的延长线上BD.CE是三角形ABC的高,点F在BD上,BF=AC,点G在的延长线上,EG=AE,求证：AG⊥AF
http://hi.baidu.com/%D0%FE%B6%BC%B7%A8%CA%A6/album/item/d3a624edcac0e31a269791e9.html
这是我空间里的
检举因为BD⊥AC,CG⊥AB
所以∠ABD=∠ACG
可证△ABF≌GCA
所以AG=AF
且∠BAF=∠CGA
因为∠BAG+∠G=90=∠BAF+∠BAG=∠GAF
所以AF⊥AG
http.∥yk.wjedu.net（八）：
在△ABc中 ,BD CE是边AC AB的中线 BD与CE相交于点O BO和OD的长度有什么关系 BC边上的中线是否一定过点O为什么?我看过别人的回答（BC边上的中线一定过点O.
证明：
延长AO交BC于F
作BG平行EC交AO延长线于G
则因E为AB中点,所以O为AG中点
连接GC,则在三角形AGC中,OD是中位线
BD平行GC ,
所以BOCG为平行四边形
F为BC中点.）
不明白为什么因E为AB中点,所以O为AG中点
解答提示：
E为AB中点,所以O为AG中点
这中间用到的是下面的结论：
“经过三角形一边中点且平行另一边的直线一定平分第三边”
也可以用比例得出：
因为BG∥EC
所以AO/OG＝AE/EB＝1
所以AO＝OG
另外,你问的“BO和OD的长度有什么关系”,应该是BO＝2OD
理由：
连接DE,则DE是三角形ABC的中位线
所以DE∥BC且DE＝BC/2
所以OD/BO＝DE/BC＝1/2
所以BO＝2OD
供参考!JSWYC追问为什么BG∥EC所以AO/OG＝AE/EB＝1,并且经过三角形一边中点且平行另一边的直线一定平分第三边初二的教过没有 回答初二没有学相似三角形或比例线段?应该是初二的内容呀,看看参考资料也许能清楚了
（注意参考资料中下面的图形提示你是可以用全等和平行四边形知识进行证明的,这个一定是学过了）
另外,BG∥EC所以AO/OG＝AE/EB＝1,也可参考：http://baike.baidu.com/view/947175.htm参考资料：http://baike.baidu.com/view/573946.htm#3
http.∥yk.wjedu.net（九）：
| I used to watch her from my kitchen window. She seemed so small as she muscled her way through the crowd of boys on the playground. The school was across the street from our home and I would often watch the kids as they played during break. I remember the first day I saw her playing basketball. I watched in wonder as she ran circles around the other kids. She managed to shoot jump shots just over their heads and into the net. The boys always tried to stop her but no one could. I began to notice her at other times, basketball in hand, playing alone. One day I asked her why she practiced so much. Without a moment of hesitation she said, “I want to go to college. The only way I can go is to get a scholarship. I am going to play college basketball. I want to be the best. My Daddy told me if the dream is big enough, the facts don’t count.” Well, I had to give it to her—she was determined. I watched her through those junior high years and into high school. Every week, she led her school team to victory. One day in her senior year, I saw her sitting in the grass, head in her arms. I walked across the street and sat down in the cool grass beside her. Quietly I asked what was wrong. “Oh, nothing,” came a soft reply, “I am just too short.” The coach told her that at 5’5” she would probably never get to play for a top ranked team—much less offered a scholarship—so she should stop dreaming about college. She was heartbroken and I felt my own throat tighten as I sensed her disappointment. I asked her if she had talked to her dad about it yet. She told me that her father said those coaches were wrong. They just did not understand the power of a dream. He told her that if she truly wanted a scholarship and that nothing could stop her except one thing — her own attitude. The next year, as she and her team went to the Northern California Championship game, she was offered a scholarship and on the college team. She was going to get the college education that she had dreamed of. 小题1:The author was probably the girl’s .
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| 小题1:C 小题2:A 小题3:C 小题4:A 小题5:C |
| 小题1:与其说是判断推理题不如说是细节题。从第一段的 our home 的 our (是指小女孩 的和作者的)，就可以判断最有可能是 mother了。（中国人和 native English speakers 在使用 人称代词 my 和 our 有不同。中国人在比较多的场合愿意用 our 实际是说的my.另外从作 者对小女孩关注的时间I watched her through those junior high years and into high school. 和 对小女孩球队获胜消息的频度Every week, she led her school team to victory.以及对小女孩的 情感上She was heartbroken and I felt my own throat tighten as I sensed her disappointment. 也 不难做出判断。 小题2:细节理解题。在文章中的第三段可以找到答案。 小题3:细节理解题。从第三段she would probably never get to play for a top ranked team—much less offered a scholarship可以得知。 小题4:判断推理题。My Daddy told me if the dream is big enough, the facts don’t count.” her father said those coaches were wrong. They just did not understand the power of a dream. He told her that if she truly wanted a scholarship and that nothing could stop her except one thing — her own attitude. 从他爸爸的回答中可以推出. 小题5:理解主旨和要义，考查概括能力。 |