4、有一堆糖果,其中奶糖占45%,再放入16块水果糖后,奶糖就占25%,那么,这堆果糖中有奶糖多少块?
5、如图,求阴影部分的周长是多少厘米?
30 度30厘米
附加题(10分) 甲、乙两人同时从A地出发,在直道A、B两地往返跑步,甲每分钟72米,乙每分钟48米,甲乙第二次迎面相遇与甲第二次从后面追上乙的两地相距80米,求A、B两地相距多少米?
1、解析:杂题(周期问题)因为二个数字是2。答案:2
2、解析:数论问题A?3=m……2 等价于A?3=(m-1)+5 A?4=n……1 等价于 A?4=(n-1)+5所以A的最小值:A=3×4+5=17
3=0.428571428571………… 6个一组循环 2012?6=335……2 第717?12=1……5 答案:5
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3、解析:数论问题由于分子分母都加上23,所以它们的差不变,仍然是102.此时分母是分子的4倍。所以此时分子为102?(4-1)=34 原来分子为:34-23=11 原来分母为:11+102=113 答案:113
4、解析:行程问题(时钟问题)这道题考查的是时钟问题。关键在找到时针和分针的速度。 分针速度:360?60=6(度/分钟) 时针速度:360?12?60=0.5(度/分钟) 从四点整开始考虑,分钟和时针都走了10分钟。四点整的时候分针时针相差: 4×30=120(度) 120-(6-0.5) ×10=65(度) 答案:65(度)
5、解析:数论问题 这道题考查数论中的因式分解。关键是考虑0是怎样出现的。因为10=2×5, 也就是说只要有一个2和一个5就会出现一个0.显然从1开始2012个连续自然数中含因数2的数远多于含因数5数。因此只需要考虑因数5的个数就可以了。这样我们需要考虑5的倍数,在2012以内,总共有20125=402…2,所以有402个因数5。但是此时我们仍然需要考虑诸如25=5*5.可以提供2个5.而在2012以内,25的倍数有:201225=80…12。所以又带来80个5.同样,我们考虑到125=5*5*5其中有3个5.在2102以内有2012125=16…12.又带来16个5.还有625=5*5*5*5.在2012以内,有2012625=3…137。又带来3个5. 所以5的个数一共有:402+80+16+3=501(个) 6、解析:分数应用题 关键在于找不变量。乙筐原来占总数:1-7.5?(
119= 20203911-)=50(千克) 50×=27.5(千克) 520207、解析:比和比例180?(1+2+3)×3=90(度)答案:直角 8、解析:分数应用题,和倍问题没有读过的:252?(1+2答案:180
9、解析:应用题2个篮球=6个排球 3个篮球=6个足球 1个篮球=1个排球+1个足球+1个网球 6个篮球=6个排球+6个足球+6个网球 即:6个篮球=2个篮球+3个篮球+6个网球所以:1个篮球=6个网球 答案:6
10、解析:计数问题(容斥原理)解法一:有34人穿黑裤子,那么穿蓝裤子的有60-34=26人,有12
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1)=72(页) 读过的:252-72=180(页)2人穿白上衣蓝裤子,说明还有26-12=14人是穿黑上衣蓝裤子,有29人穿黑上衣,那么,有29-14=15人穿黑上衣黑裤子。
解法二:34人穿黑裤子中,则穿白色或黑色上衣。29人穿黑上衣,则穿黑色或蓝色裤子。再加上12人穿白色上衣蓝裤子,则比总人数多加了穿黑上衣黑裤子的人数。所以穿黑上衣黑裤子的人数为:(12+34+29)-60=15(人)
二、计算题(每题5分,共20分) 0.125 二分之七 0.5 690 三、应用题(每题8分,共40分)1、解析:分数应用题
(600-20)?(1?)=870(元) (870+100)?(1?)=1212.5(元) 2、解析:行程问题
在乙到达山顶走180米这段时间内,甲恰好下到半山腰,因为甲下山的速度是上山速度的1.5倍,所以当甲下山走了一半就相当于又向上走了山高的
13151(在相同的时间内,路程比等于速度比),故当甲走到山3顶的时候,乙走了180?3=540米,此时还距离山顶180米,所以从山脚到山顶是540+180=720米. 3、解析:工程问题
111,乙功效+丙功效=,丙功效+甲功效=, 89187三个式子相加为 甲功效+乙功效+丙功效=,
481故丙的功效为,所以丙一个人来做,完成这项工作需要48天.
48设工程总量为'1\甲功效+乙功效=4、解析:分数应用题
原来奶糖:水果糖=45:55=9:11,现在为奶糖:水果糖=25:75=1:3, 奶糖没有变化,故把份数化为一样,原来奶糖:水果糖=9:11,
现在为奶糖:水果糖=9:27,水果糖增加16份,水果糖又是增加16块, 所以1份是一块,所以奶糖的9块。
5、解析:几何求曲线周长阴影部分的周长为两个圆弧加上直一条直径,
2???15?2+2???30?30?360+30=20π+30=92.8(厘米)
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附加题(10分)解析:行程问题(多次相遇和追及问题)
第二次甲追上乙的地点第二次相遇地点第一次相遇地点A甲和乙的速度之比为72:48=3:2故相同的时间内甲的路程和乙的路程比试3:2.
B
如果总路程有5格,第一次迎面相遇,两人加在一起走了2个全程,总共走10格,甲走6格,乙走4格。第二次迎面相遇两人加在一起一共走了4个全程,一共20格。甲走12格,乙走8格,相遇地点如图所示。
而当甲第一次追上乙,要比乙多走10格,故第一追上乙,甲需要走30格才能追上乙,第二次追上乙还需要再走30格,第二次追上乙的地点如图所示,故甲乙第二次迎面相遇与甲第二次从后面追上乙的两地相距为两格,所以1格距离为:80?2=40米,故A、B两地相距40*5=200米. 答案:200(米)
郑州一中实验初中2013年宏志生选拔
英语试题
说明: 本试卷满分20分,考试时间20分钟。
一、单项选择,请把正确选项的序号填入题前括号内。(每小题0.5分,共10分)
( ) 1. __________something warm. It’s cold today.
A. Take off B. Take on C. Put on D. Put off
( ) 2. The concert is ______Wednesday_________seven o’clock.
A. in; at B. from; in C. at; from D. on; at
( ) 3. What beautiful clothes_______!
A. are they B. they are C. is it D. it is
( ) 4. Call Alice, but don’t ask _____about the party at_____ house on Saturday.
A. she; her B. her; hers C she; she D. her; her
( ) 5. –Jane______jogging every morning.
A. go B. going C . goes D. goes to
( ) 6. --– _____shirt is this? ---It’s ______.
A. Who’s; Kate’s B. Whose; Kates’s C. Which; Kate’s D. Whose; her
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( ) 7. Mr Brown is _____teacher. We students like _____very much.
A. his; her B. my;mine C.my; him D. her;her
( ) 8. ----Nancy and her daughter _______shopping tomorrow.
A. goes B. is going C. will go D. will going
( ) 9. ---- ________is it by your watch? ----A quarter to ten.
A. What colour B.How many C. How much D. What time
( ) 10. Lily can play_____ guitar but she can’t play ____chess.
A. a;the B./;the C.the; / D. the; a
( ) 11. 6:45 means ―___________‖.
A. a quarter past seven B. a quarter to seven C. a quarter past six D. a quarter to six
( ) 12.---Does John’s sister like fashion shows? ---- Yes. She often ________them on TV.
A. sees B. looks C. finds D. watches
( )13---What does he like _____dinner? ---Beef and bread
A. at B. in C.to D.for
( ) 14.______is the sixth month of the year. A. March B. June C. July D. November
( ) 15.Mary sings_______. Her friends think she is a _______singer.
A. good; good B. well; well C. good; well D. well;good
( ) 16. You are so busy. What do you want me ______for you? A. do B. to do C. does D. doing
( ) 17._____Sunday mornings, Jack’s brother usually gets up________eight o’clock. A. At; on B. In; on C. On; at D.In; at
( ) 18. We are going to play soccer this afternoon. Come and join_____. A. we B. us C.our D. ours.
( )19.---Do you like to play basketball_______soccer? ---I like to play basketball.
A. and B. or C. both D. with ( ) 20.----Do you want some ______? ----No, thanks.
A. hamburger B. banana C. orange D. egg 二、完形填空(每小题0.5分,共5分)
Today is Thursday, December 26th.. ken is really busy. __1__ start at 8:00. The __2__class is math. He doesn’t like math. He thinks it is too__3__. Then at 9:00 he has English. English is his favorite subject __4__ it’s interesting. He likes his English teacher, Miss Wang. She is friendly. Then he does morning exercises__5__about ten minutes. At 10:15 he __6__ history. It’s boring, but at 11:00 he has P.E. He likes P.E., but he is usually very __7__ after class. He eats lunch at 12:15. At 2:30 he starts his ___8___classes. His last class __9__ at 4:30. After class, he often plays basketball __10__ his friends. He thinks it’s cool!
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