2017年初中八年级寒假作业答案

2017年初中八年级寒假作业答案 精品文档 2017年初中八年级寒假作业答案 下文是关于2017年初中八年级寒假作业答案相关内容，希望对你有一定的帮助: 2017年初中八年级寒假作业答案:2017年八年级地理寒假作业 2016-2017年八年级地理寒假作业 一、填出下列省级行政区的名称、简称、行政中心。(有两个简称的省份必须两个都写) 二、请在图中画出我国的主要山脉:天山、阴山、昆仑山、秦岭、南岭、大兴安岭、太行山、巫山、 雪峰山、长白山、武夷山、台湾山脉、小兴安岭、阿尔泰山、祁连山、横断山脉、贺兰山、喜马拉雅山脉等，并填出我国主要地形区(三大平原、三大丘陵、四大高原、四大盆地)。 1 三、请画出我国铁路干线(“五纵三横”) 四、请画出四大工业基地图，并标上名称和特点 1 / 54 精品文档 五、在图中画出我国的三级阶梯分布图、温度带图、干湿区图、气候类型图、季风区和非季风区图、四大地理区图，请写上图名。本题老师给出的中国地图少了中国的哪部分, (本次期末考已及格的同学可以不做以下题目) 六、填出北方地区的主要山脉、河流和地形区。 七、填出南方地区的主要山脉、河流和地形区。 2 2017年初中八年级寒假作业答案:2016八年级寒假作业上 初二数学寒假作业1(全等三角形) 一、填空与选择 1(已知?ABC??DEF，?A=80?，?E=50?，则?F的度数为( ) A、 30? B、 50? C、 80? D、 100? 2 / 54 精品文档 2(已知图中的两个三角形全等，则 的度数是( ) A(72? B(60? C(58? D(50? 3(如图，?E=?F=90?，?B=?C，AE=AF，给出下列结论:??1=?2;?BE=CF;??ACN??ABM;?CD=DN，其中正确的结论有( ) A、1个 B、2个 C、3个 D、4个 c B 58? c b 第3题图 第2题图 4 3 / 54 精品文档 (?ABC是格点三角形(顶点在网格线的交点)，则在图中能够作出?ABC全等且有一条公共边的格点三角形(不含?ABC)的个数是( ) A、1个 B、2个 C、3个 D、4个 5(如图，AC、BD相交于点0，?A=?D，请补充一个条件，使?AOB??DOC，你补充的条件是 (填出一个即可)( BECF 第8题图 第9题图 第7题图 第6题图 图26(已知，如图:?ABC =?DEF，AB =DE，要说明?ABC ??DEF: 1)若以“SAS”为依据，还要添加的条件为______________; 2)若以“ASA”为依据，还要添加的条件为______________; 4 / 54 精品文档 3)若以“AAS”为依据，还要添加的条件为______________( 7(如图?ACB,?DFE，BC,EF，根据“ASA”,应补充一个直接条件___________，根据“AAS”，那么补充的条件为____________，才能使?ABC??DEF( 8(如图，在Rt?ABC中，?C=90?，AC=10，BC=5，线段PQ=AB，P、Q两点分别在AC和过点A且垂直于AC的射线AO上运动，当AP= 时，?ABC和?PQA全等. 9(如右图示，?ABE和?ADC是?ABC分别沿着AB，AC边翻折180?形成的，若?1??2??3=28?5?3，则?α的度数为 。 10(AD是?ABC的边BC上的中线，AB,12，AC,8，则中线AD的取值范围是 二、简答题 11(如图，在?ABC和?ABD中，AC与BD相交于点E，AD=BC，?DAB=?CBA， 5 / 54 精品文档 求证:AC=BD( 12(如图，AC和BD相交于点O，OA=OC，OB=OD(求证:DC?AB( 13(如图，已知点A、F、E、C在同一直线上，AB?CD，?ABE=?CDF，AF=CE( (1)从图中任找两组全等三角形;(2)从(1)中任选一组进行证明( 14(在?ABC中，AB=AC，点E，F分别在AB，AC上，AE=AF，BF与CE相交于点P(求证:PB=PC，并直接写出图中其他相等的线段( 15(如图，已知:在?AFD和?CEB中，点A、E、F、C在同一直线上，AE=CF，?B=?D，AD?BC(求证:AD=BC( 16(如图，C为BE上一点，点A，D分别在BE两侧(AB?ED，AB CE，BC ED(那么AC与CD相等吗,并说明理由( 6 / 54 精品文档 E B2017年初中八年级寒假作业答案。 D 17(如图，?DCE=90?，CD=CE，AD?AC，BE?AC，垂足分别为A、B(求证:AD+AB=BE( 18(如图?A、E、F、C在一条直线上，AE=CF，过E、F分别作DE?AC，BF?AC，若AB=CD( (1)图?中有 对全等三角形，并把它们写出来 (2)求证:BD与EF互相平分于G; (3)若将?ABF的边AF沿GA方向移动变为图?时，其余条件不变，第(2)题中的结论是否成立，如果成立，请予证明( 19(CD经过 BCA顶点C的一条直线，CA CB(E，F分别是直线CD上两点，且 BEC CFA ( (1)若直线CD经过 BCA的内部，且E，F在射线CD上， 7 / 54 精品文档 ?如图1，若 BCA 90 ， 90 ，则BE CF; ?如图2，若0 BCA 180 ，请添加一个关于 与 BCA关系的条件 ，使?中的结论仍然成立，并说明理由( (2)如图3，若直线CD经过 BCA的外部， BCA，请提出EF，BE，AF三条线段数量关系的合理猜想: ( A D D A A (图1) (图2) (图3) 20.如图，已知?ABC中，AB,AC,5厘米，BC,4厘米，点D为AB的中点(如果点P在线段BC上以1.5厘米/秒的速度由B点向C点运动，同时，点Q在线段CA上由C点向A点运动( (1)若点Q的运动速度与点P的运动速度相等，经过1秒后，?BPD与?CQP是否全等， 8 / 54 精品文档 请说明理由; (2)若点Q的运动速度与点P的运动速度不相等，当点Q的运动速度为多少时，能够使 ?BPD与?CQP全等, 初二数学寒假作业2(轴对称图形) 一、精心选一选 1.如图，下列图案是我国几家银行的标志，其中是轴对称图形的有( ) A .1个 B. 2个 C. 3个 D. 4个 2.在?ABC内一点P满足PA=PB=PC，则点P一定是?ABC( ) A.三条角平分线的交点 B.三边垂直平分线的交点 9 / 54 精品文档 C.三条高的交点 D.三条中线的交点 3.下列语句:?全等三角形的周长相等?面积相等的三角形是全等三角形?若成轴对称的两个图形中的对称线段所在直线相交,则这个交点一定在对称轴上(其中正确的有( ) A(0个 B(1个 C(2个 D(3个 4.用直尺和圆规作一个角的平分线的示意图如图所示，则能说明?AOC,?BOC的依据是( ) A(SSS B(ASA C(AAS D(角平分线上的点到角两边距离相等 第4题图 5.如图是一个经过改造的台球桌面示意图，图中四个角上的阴影部分分别 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 示四个入球孔。如果一个球按图中所示的方向被击出(球可以经过多次反射)，那么该球最后将落入的球袋是( )A、一号袋 B、二号袋 C、三号 10 / 54 精品文档 袋 D、四号袋 6.如图，?MON内有一点P，P点关于OM的轴对称点是G，P点关于ON的轴对称点是H，GH分别交OM、ON于A、B点，若GH的长为10cm，求?PAB的周长为( ) A( 5cm B( 10cm C( 20cm D(15cm 7.如图，?AOB的平分线上一点P到OA的距离为5，Q是OB上任意一点，则( ) A(PQ?5 B(PQ,5 C(PQ?5 D(PQ,5 B Q AO 第6题图 第7题图 第8题图 11 / 54 精品文档 8.如图，在2?2的正方形网格中，有一个格点?ABC(阴影部分)，则网格中所有与?ABC 成轴对称的格点三角形的个数为( ) A(2 B(3 C(4 D( 5 2017年初中八年级寒假作业答案:最新人教版八年级英语 上册 三年级上册必备古诗语文八年级上册教案下载人教社三年级上册数学 pdf四年级上册口算下载三年级数学教材上册pdf 寒假作业(2017年) 最新人教版八年级英语上册寒假作业(2017年) Unit 1 姓名________ 学号________ 班级________ 得分________ 二、单项选择 (每小题1分，共15分) ( )31. — Where did you go on ____ vacation?— I went 12 / 54 精品文档 to London. A. a B. an C. the D. / ( )32. Look, the plane is flying _________ the mountain. A. over B. below C. under D. through ( )33. I ate all the cakes on the table ________ I was hungry. A. so B. though C. because D. if ( )34. — The soccer game was so ________.— Yes, I felt ________ with it. A. bored; boring B. boring; boredC. bored; bored D. boring; boring ( )35. __________ like playing basketball and badminton are popular with students. 13 / 54 精品文档 A. Meetings B. Mountains C. Activities D. Buildings ( )36. Please turn on the TV. I ________ what the weather will be like tomorrow. A. wonder B. feed C. know D. cross ( )37. — ________ did you go to Guilin with?— My parents. A. Where B. Who C. When D. How ( )38. We went to our old school last week. It looked the same ________ before. A. as B. with C. to D. around ( )39. — Why didn’t you get to the top of the mountain?— We didn’t have ________ time. A. free B. RightC. natural D. enough 14 / 54 精品文档 ( )40. The boy decided _____ back the money to the person who lost it. A. give B. gives C. to give D. to giving ( )41. — Are you free tomorrow?— Yes, I am. I have ________ to do. A. anything specialB. special anything C. nothing specialD. special nothing ( )42. — Did he help you with your homework?— No, I did it by __________. A. I B. me C. mine D. myself ( )43. Bob likes reading. He spends ________ of his free time reading books. A. few B. any C. little D. most 15 / 54 精品文档 ( )44. — Did everyone enjoy the school trip?— ________. We all had a good time. A. Yes, they did B. No, they didn’t C. Yes, we did D. No, we didn’t ( )45. — Did you enjoy the food in China? — ________. It was very delicious. A. Sounds great B. Of course C. Good idea D. No problem 三、完形填空 (每小题1分，共10分) lost it there. He decided to it to the train office. Then the phone rang (响) and he answered, “Hello.” A 49 said, “Hi, this is Michelle. You’re using my phone. I 50 it on the train.” Josh said, “Yes, I found it. And I will take it to the train office.” “Oh, that’s very nice of you. If you leave your address 16 / 54 精品文档 (地址), I would like to post you ,20 to you.” Josh said no problem. When the woman came, she got her and a piece of paper (一张纸). Josh left it for it wasn’t. On the paper she found“Don’t worry about the ( )46. A. train B. bus C. subway D. bike2017年初中八年级寒假作业答案。 ( )47. A. Anyone B. Someone C. Everyone D. No one ( )48. A. take B. sell C. move D. blow ( )49. A. girl B. boy C. woman D. man ( )50. A. remembered B. left C. bought D. saved ( )51. A. meet B. hear C. visit D. thank ( )52. A. number B. book C. phone D. diary 17 / 54 精品文档 ( )53. A. him B. them C. me D. her ( )54. A. and B. but C. if D. so ( )55. A. money B. time C. place D. people 四、阅读理解(一) (每小题2分，共30分) A Do you have any good ways to learn English well? Here are some students talking about ways of learning A. 3. B. 4. C. 5. D. 6. ( )57. How does Mark learn English? A. By reading textbooks. B. By reading class notes. C. By reading English stories. D. By reading English newspapers. 18 / 54 精品文档 ( )58. Who learns English by watching English movies? A. Mark. B. Jenny. C. Tom. D. Amy. ( )59. What is the best way to learn English according to Tom? A. Speaking. B. Reading. C. Listening. D. Writing. ( )60. Which of the following is TRUE according to the passage? A. Jenny and Amy are of the same age. B. Listening to the radio can help Mark with his English listening. C. Amy asks us to make full use of our piecemeal time. D. We have to remember many English words before 19 / 54 精品文档 sleeping. B I went on vacation with my family last summer. “Wake up! It’s time to go fishing,” My mom woke me up. After having breakfast we got on a boat. Getting up at 6 a.m. was really early and I was not happy, but later, I had fun. My uncle caught (抓住) a big fish first. And my mom caught one, too. Then I caught a 下文是关于2017年初中八年级寒假作业答案相关内容， 希望对你有一定的帮助: I went on vacation with my family last summer. “Wake up! It’s time to go fishing,” My mom woke me up. After having breakfast we got on a boat. Getting up at 6 a.m. was really early and I was not happy, but later, I had fun. My uncle caught (抓住) a big fish first. And my mom caught one, too. Then I caught a Black Drum. Next, my heard this. Later we tried to catch small sharks (鲨 鱼). My grandpa caught one, but it snapped the line (咬 断绳子). My uncle caught one, but it also snapped the 20 / 54 精品文档 line. My dad caught one at last. It didn’t look so scary but was a little funny. Then our fishing activity was over, and we went back with all the fishes. We were tired but happy! ( )61. Who woke up the writer? A. His father. B. His mother. C. His uncle. D. His grandpa. ( )62. The underlined word “captain” means “_______” in Chinese. A. 船长 B. 律师 C. 司机 D. 飞行员 ( )63. Why did they feel happy when they heard the captain’s words (话)? A. Because someone caught a fish the same size as 21 / 54 精品文档 theirs. B. Because the Black Drum was expensive. C. Because the fish was the biggest (最大的). D. Because the boat went very fast. ( )64. How did they feel when they went back with the fishes? A. Scared. B. Lucky. C. Tired and terrible. D. Tired but happy. ( )65. What does the writer talk about? A. His summer vacation. B. His favorite fish. C. His favorite activity. D. His happy family. C 22 / 54 精品文档 There is an old dog in Mr. Smith’s family. The dog’ s name is Buddy. When Buddy was young, he could run fast and catch many animals. Mr. Smith loved him very much. Now, Buddy is old and weak. One day, Mr. Smith and Buddy walked into the forest. Buddy saw a pig and caught it, but he was too old and weak and the pig ran away at last.They didn’t get anything that day and went home. Mr. Smith was not happy. He said to Mrs. Smith, “Buddy is too old. He doesn’t catch anything today.” Mrs. Smith answered, “Buddy didn’t do anything wrong (错误的). It’s natural for him to get old. For many years, he helped us catch animals and feed our family. So we shouldn’t be angry (生气的) with him.” Then Mr. Smith knew he was wrong. He said, “I shouldn’ t dislike him for being old. I will love him and be good to him just as before.” 23 / 54 精品文档 ( )66. What is Buddy? A. A dog. B. A mouse. C. A cat. D. A hen. ( )67. Why didn’t Buddy catch the pig? A. Because he was hungry. B. Because he was not happy. C. Because he was old and weak. D. Because he didn’t want to kill it. ( )68. What did Mr. Smith and Buddy get that day? A. A sheep. B. A pig. C. Some fruit. D. Nothing. ( )69. Which of the following is TRUE? A. Buddy worked hard when he was young. 24 / 54 精品文档 B. Buddy didn’t like catching animals. C. Mr. Smith didn’t like Buddy when it was young. D. Mrs. Smith was angry with Buddy. ( )70 What does Mr. Smith want to do? A. Sell Buddy to the zoo. B. Give Buddy to his friend. C. Leave Buddy in the forest. D. Love and be good to Buddy. 五、单词拼写。(每小题1分，共10分) 71. Let the b_______ fly away. It will be happy. 72. I didn’t w_______ for the bus because it was too late. 25 / 54 精品文档 73. — Did a____________ go there with you? — No, I went there myself. 74. I d________ him because he never does his homework. 75. Do you want to buy anything for y________? 76. My Grandma has a ___________ (母鸡) and she likes it very much. 77. This ________ (雨伞) is not mine. It’s Lily’s. 78. I put the ________ (湿的) clothes on the desk just now. 79. There are lots of flowers on the _______ (小山) near my home. 80. We can see the _______ (不同) between the two books. 26 / 54 精品文档 and I rode 82. _____ every day. There was a little 83. _____ in my grandparents’ home. I fedit every morning. After a few days, it followed me 84. ______ I went. It was really interesting. I heard some 85. ________ stories from my grandpa. When he finished telling a story, he always taught me to learn something from it. I really had a great vacation. 七、阅读理解(二) (每小题2分，共10分) My name is Lily and I’m thirteen. Many students in our school have interesting hobbies (爱好). Do you have one? If you don’t, you can join the Dance Club. I started dancing six years ago. I started my hobby because I like dancing. I hope (希望) I can dance on TV one day, so I learned to dance. I also think dancing is a good exercise. Some people think dancing is boring. Well, I don’t think so. Dancing is a beautiful art and it is fun. If you want to be graceful and elegant (优美端庄的), you can 27 / 54 精品文档 join us. The Dance Club members (成员) often meet on Mondays after school. You must bring sport clothes to the meeting because we will do some easy exercise before dancing. If you are interested in dancing, or if you are good at dancing, come and join us! 86. What is Lily’s hobby? _______________________________________________________________________________ 87. How old was Lily when she started dancing? _______________________________________________________________________________ 88. Does Lily think dancing is boring? 28 / 54 精品文档 _______________________________________________________________________________ 89. When do the Dance Club members meet? _______________________________________________________________________________ 90. What must you bring if you go to the meeting? _______________________________________________________________________________ 八、 书 关于书的成语关于读书的排比句社区图书漂流公约怎么写关于读书的小报汉书pdf 面表达 (共10分) 假设今天你和你的同学游览了鼓楼和北京胡同，请你根据以 下提示，写一篇日记发表在某英文网站上。 提示: 1. Where did you go? 2. What did you like? 29 / 54 精品文档 3. What did you eat? 4. How did you feel about the visit? ,, 参考词汇: 鼓楼 the Drum Tower; 历史感 a sense of history; 传统的 traditional 要求: 1. 语句通顺、逻辑连贯; 2. 不少于60词。开头已给出，不计入总词数。 Sunday, July 19th Today it was ___________________________________________________ _______________ 30 / 54 精品文档 ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Unit 1参考答案 二、31-35 DACBC 36-40 ABADC 41-45 CDDCB 三、46-50 ABACB 51-55 DCDBA 四、56-60 BCBAC61-65 BACDA 66-70 ACDAD 31 / 54 精品文档 五、71. bird 72. wait 73. anyone 74. dislike 75. yourself 76. hen 77. umbrella 78. wet 79. hill80. difference 六、81. seemed 82. bicycles 83. duck 84. anywhere 85. wonderful七、86. Dancing. 87. Seven / 7. 88. No, she doesn’t. 89. On Mondays after school. 90. Sport clothes. 八、 Sunday, July 19th Today it was hot and sunny. I went to visit the Drum Tower with my classmate. It was beautiful. And then we walked along a Beijing hutong. We saw some old buildings here. They looked special. I wondered what life was like here in the past. I liked the hutong a lot because it gave me a sense of history. For dinner we tried some traditional Chinese food. It tasted good. In the evening we felt tired and went to 32 / 54 精品文档 bed early. Unit 2 姓名________ 学号________ 班级________ 得分 ________ 一、听力理解 (略) 二、单项选择 (每小题1分，共15分) ( )31. — What do you often do on ___________ weekends? — I often go ________ online. A. the; / B. /; / C. /; the D. the; the ( )32. — Why do you often exercise? — Because it is good _______ my health. 2017年初中八年级寒假作业答案:2017年八年级寒假数学作 33 / 54 精品文档 业(1) 八年级数学寒假作业(1) 1(下列各数:1.34,,, π, 0.020020002,,, 6.57896,是无理数的是( ) 2 A. 2个 B. 3个 C. 4个 D. 5个 2(16的平方根是( ) A. ?4 B. ,4 C. 4 D. ?2 3(某青年排球队12名队员的年龄情况如下: 则这个队队员年龄的众数和中位数是( )( A(19，20 B(19， C(19，20(5 D(20，19 4(下列各式中, 已经化简的是 ( ) 3 34 / 54 精品文档 A. 1 B. 20 C. 22 D. 121 5(如图:在?AB,中，若?A,65???1,115?，则?B的度数是( )。 A. 40 B. 50 C. 60 D.70. 6(以方程组 y ,x,2 的解为坐标的点(x,y)在平面直角坐标系中的位置是( ) y x,1 A(第一象限 B.第二象限 C.第三象限 D.第四象限 7(刘翔在出征雅典奥运会前刻苦进行110米跨栏训练，教练对他10次的训练成绩进行统计分析，判断他的成绩是否稳定，则教练需要知道刘翔这10次成绩的( ) A(众数 B(方差 C(平均数 D(频数 8(《九章算术》中 35 / 54 精品文档 记载一个这样的问题“五只雀、六只燕，共重1斤(等于16两)，雀重燕轻，互换其中一只，恰好一样重，问:每只雀、燕的重量各为多少,”如果设雀重x两，燕重y两，根据题意列出方程组正 确的是( ) A( B( C( D( 9、下列四个命题中，真命题有( ) ?两条直线被第三条直线所截，内错角相等( ?三角形的外角大于内角 ?如果?1和?2是对顶角，那么?1=?2( ?0.3，0.4，0.5是一组勾股数( A(1个 B(2个 C(3个 D(4个 10. 已知一次函数y kx,k，若y随着x的增大而减小则该函数的图像经过:( ) A(第一、二、三象限 B(第一、二、四象限 C(第二、三、四象限 D(第一、 36 / 54 精品文档 三、四象限 二(填空题:(每题4分，共24分) 11. 点P(-3，4)到x轴的距离是__________，到原点的距离是 。 12(已知直角三角形的两直角边长分别为 和 ，则斜边上的高为 。 13.已知一次函数y kx,5与直线y 为 。 1 x的图象平行,则这个一次函数表达式2 14.如右图，AB?CD，BC?DE，若?B=50?，则?D的度数 。 15(某校对甲、乙两名跳高运动员的近期跳高成绩进行统计分析，结果如下:x甲 1.69m， 37 / 54 精品文档 22 x乙 1.69m，S甲 0.0006，S乙 0.00315，则这两名运动员中 的成绩更稳定; 16(如图，圆柱的底面周长为6cm，AC是底面圆的直径，高BC=6cm，点P是BC上一点，且PC= 2 BC。一只蚂蚁从A点出发沿着圆柱体的表面爬3 行到点P的最短距离是 三、解答题(17—19题每题6分，20—22题每题7分，23—25题每题9分，共66分) 17(化简: 19. 假期中，小明和同学们到某海岛上去探宝旅游，按照探宝图，他们登陆后先往东走8 千米，又往北走2千米，遇到障碍后又往西走了3千米，再 38 / 54 精品文档 折向北走了6千米处往东一拐，仅走了1千米就找到宝藏，问登陆点A到宝藏埋藏点B的直线距离是多少千米, 20、如图，已知AB?CD，?A =100，CB平分?ACD，求?ACD、?ABC的度数。 21. 列方程组解应用题:医院用甲、乙两种原料为手术后的病人配制营养品(每克甲原料 72 8 4x,3y 5 ,23,123,1 18.解方程组: x,2y 4 ,,,, 含0.5单位蛋白质和1单位铁质，每克乙原料含0.7单位蛋 39 / 54 精品文档 白质和0.4单位铁质(若病人每餐需要35单位蛋白质和40单位铁质，那么每餐甲、乙两种原料各多少克恰好满足病人的需要, 22、已知A、B两地相距100千米，甲、乙两人骑自行车分别从A，B两地相向而行(假设他们都保持匀速行驶，则他们各自到A地的距离s(千米)都是骑车时间t(时)的一次函数，其中甲乙两人s与t之间的关系的图像如右图: (1)l1表示哪辆汽车到A地的距离与行驶时间的关系, (2)汽车乙的速度是多少, (3)求l1，l2分别表示两辆汽车的S与t的关系式。 (4)行驶多长时间后，A、B两车相遇, 23.八年级数学科老师在一次“探究性学习”课中，给出如下数表: (1)请你分别认真观察线段a、b、c的长与n之间的关系，用含n(n为自然数，且n>1)的代数式2017年初中八年级寒假作业答案。 表示: a= 40 / 54 精品文档 b= c= (2)猜想:以线段a、b、c为边的三角形是否是直角三角形, 并说明你的结论。 24( 如图，直线AB与x轴交于点A(1，0)，与y轴交于点B(0，,2)( (1)求直线AB的解析式; (2)若直线AB上的点C在第一象限，且S?BOC=2，求点C的坐标( 25、(1)、已知，如图(a)，直线AB?ED。 求证:?ABC+?CDE=?BCD。 (2)、已知，如图(b)，直线AB?ED，请你猜想?ABC、?CDE、?BCD的关系是: 。 41 / 54 精品文档 (3)、已知，如图(c)，直线AB?ED，请你猜想?ABC、?CDE、?BCD的关系是: 。 (4)已知，如图(d)，直线AB?ED，请你猜想?ABC、?CDE、?BCD的关系是: 。 (5)已知，如图(e)，直线AB?EF，若?B=30º，?D=70º，?E=20º，则?C= 度。 2017年初中八年级寒假作业答案:2017年八年级地理寒假作业 (1) 2016-2017年八年级地理寒假作业 一、填出下列省级行政区的名称、简称、行政中心。(有两 42 / 54 精品文档 个简称的省份必须两个都写) 二、请在图中画出我国的主要山脉:天山、阴山、昆仑山、秦岭、南岭、大兴安岭、太行山、巫山、雪峰山、长白山、武夷山、台湾山脉、小兴安岭、阿尔泰山、祁连山、横断山脉、贺兰山、喜马拉雅山脉等，并填出我国主要地形区(三大平原、三大丘陵、四大高原、四大盆地)。 下文是关于2017年初中八年级寒假作业答案相关内容，希望对你有一定的帮助: 1 三、请画出我国铁路干线(“五纵三横”) 四、请画出四大工业基地图，并标上名称和特点 五、在图中画出我国的三级阶梯分布图、温度带图、干湿区图、气候类型图、季风区和非季风区图、四大地理区图，请写上图名。本题老师给出的中国地图少了中国的哪部分, (本次期末考已及格的同学可以不做以下题目) 六、填出北方地区的主要山脉、河流和地形区。 43 / 54 精品文档 七、填出南方地区的主要山脉、河流和地形区。 2 2017年初中八年级寒假作业答案:2017年八年级寒假数学作业(2) 八年级数学寒假作业(2) 1A(1 B(5 C(7 D(25 2、下列四组数据中，不能作为直角三角形的三边长的是 ( ) ((A( 7,24,25 B(6,8,10 C(9,12,15 D(3,4,6 3. 点P(3,,5)关于y轴对称的点的坐标为( ) A( (,3,,5) B((5,3) C((,3,5) D((3,5) 4. 下列各式中,正确的是( ) A( 4 B( 4 C(,27 ,3 D((,4)2 ,4 44 / 54 精品文档 5(某足球队共有23名队员，他们的年龄情况如图所示， 则该足球队年龄的众数、中位数分别是( ) A(25，26 B(26，26 C(5，6 D(30，26 6、如图，学校有一块长方形花圃，有个别人为了避开拐角而 走“捷径”，在花圃内走出了一条“路”，他们仅仅少走了( ) A(7米 B(5米 C(2米 D(1米 7、对于一次函数y ,2x,3的图象描述正确的是( ) (A)是过原点的直线 (B)与x轴的交点是(-2，0) (C)不经过第三象限 (D)y的值随x值的增大而增大 8、下列命题中是真命题的是( ) A(如果a=b，则a=b B(无限小数都是无理数 C(三角形的一个外角大于任何一个内角 D(过直线外一点有且只有一条直线与已知直线垂直 9、若关于x、y的方程组 2 45 / 54 精品文档 2 "路" 3m 4m x 1 2x,y b 的解是 ，那么a,2b的值为( ) y 1 x,by a A(1 B(2 C(4 D(-1 10、已知两点M(3，5)，N(1，,1)，点P是x轴上一动点，若使PM+PN最短，则点P的坐标应为 A. ( 1243 46 / 54 精品文档 ，,4) B. ( ，0) C. (， 0)D. (，0) 2332 二、填空题:(每题4分，共24分) 11、如果数据1，4，x，5的平均数是3，那么x= . 12、如果一个二元一次方程组的解是 x 1 ，请你写出一个符合题意的 y ,1 二元一次方程组 ( 2 47 / 54 精品文档 13、等腰?ABC的腰长AB,10cm，底BC为16cm，面积为 cm. 图7 14、在资阳市团委发起的“暖冬行动”中，某班50名同学响应号召，纷纷捐出零花钱(若不同捐款金额的捐款人数百分比统计结果如图7所示，则该班同学平均每人捐款________元( 15、函数y ,5x,2与两坐标轴围成的三角形面积是 。 1 16. 如图，在平面直角坐标系中，O为坐标原点，四边形OABC是长方形， BC?OA，点A、C的坐标分别为A(10,0)，C(0,4)，M是OA的中点， 点P在BC边上运动。当 OPM是腰长为5的等腰三角形时， 则点P的坐标为 . 48 / 54 精品文档 三、解答题(17—19题每题6分，20—22题每题7分，23—25题每题9分，共66分，) 17(计算:3 (2 ,4 ); 18. 如图，在每个小正方形的边长均为1个单位长度的方格纸中，有线段AB和直线 MN，点A,B,M,N均在小正方形的顶点上( (1)在方格纸中画四边形ABCD(四边形的各顶点均在小正 方形的顶点上)，使四边形ABCD是以直线MN为对称 轴的轴对称图形，点A的对称点为点D，点B的对称点 为点C; (2)写出四边形ABCD的周长和面积( 19. 某产品每件成本10元，试销阶段每件产品的销售价x 49 / 54 精品文档 (元)与产品的日销售量y(件) (1)求出日销售量y(件)与销售价x(元)的函数关系式 (2)求销售价定为30元时，每日的销售量和销售利润 20( 如图，直线AD与AB、CD相交于A、D两点，EC、BF与AB、CD相交于E、C、B、F，如果?1=?2，?B=?C(说明?A=?D( 2 21、某中学开展“唱红歌”比赛活动，九年级(1)、(2)班根据初赛成绩，各选出5名选手参加复赛，两个班各选出的5名选手的复赛成绩(满分为100分)如图所示( 分析哪个班级的复赛成绩较好; (3)计算两班复赛成绩的方差( 22、一个两位数，十位上的数与个位上的数的和是5，如果这个两位数减去27，则恰好等于十位上的数与个位上的数对调后组成的两位数，求这个两位数。 50 / 54 精品文档 23、细心观察，如图OA1答问题:OA2=( 22 A1A2 AA2A3 A3A4 A4A5 1，认真分析各式， 然后解 22 )2,1 2 S1= ; ; 2 OA3=(2)2,1 3 S2= OA 4=()2,1 4 S3=2 51 / 54 精品文档 „„ „„ (1)请用含有n(n是正整数)的等式表示上述变化规律( (2)推算出OA10的长( (3)若一个三角形的面积是，计算说明他是第几个三角形, 222 (4)求出S12,S2的值( ,S3, ,S10 3 24、如图1，长方形OABC中，AB = 8，OA = 4，把长方形OABC折叠，使点B与点O重合，点C移到点F位置，折痕为DE( (1)求OD的长; (2)请判断?OED的形状，并说明理由; (3)如图2，以O点为坐标原点，OC、OA 所在的直线分别 52 / 54 精品文档 为x轴、y轴，建立直角坐标系，求直线DE的函数表达式，并判断点B关于x轴对称的点B′是否在直线DE上, (第24题图1) (第24题图2) 25.问题背景: 在?ABC中，AB、BC、AC三边的长分别为、、，求这个三角形的面积( 小辉同学在解答这道题时，先建立一个正方形网格(每个小正方形的边长为1)，再在网格中画出格点?ABC(即?ABC三个顶点都在小正方形的顶点处)，如图?所示(这样不需求?ABC的高，而借用网格就能计算出它的面积( (1)请你将?ABC的面积直接填写在横线上 ; 思维拓展: (2)我们把上述求?ABC面积的方法叫做构图法(若?ABC三边的长分别为、 、 53 / 54 精品文档 (a,0)，请利用图?的正方形网格(每个小正方形的边长为a)画出相应的?ABC，并求出它的面积; 探索创新: (3)若?ABC三边的长分别为、、(m,0，n,0，且m?n)，试运用构图法求出这三角形的面积( 4 2017年初中八年级寒假作业答案:八年级寒假作业答案 八年级寒假作业答案 54 / 54