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九年级M1-3测验 幻灯片

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外研版英语课件九上：M1M1-3

外研版英语课件九上：M1M1-3

6. 现在完成时 现在完成时与一般过去时所表示的行为都发生在过去， 但是两者表达的重点不同：一般过去时表述过去的事情，现 在完成时则强调过去的行为对现在的影响，对比两种时态：
A: Have you seen the film? B: Yes, I have. A: When did you see it? B: Last night.
5. 一般将来时 一般将来时表述的是发生在将来的事情或行为以及未来 的状态，在表示对将来的预测时(没有相关迹象表明某事必然 会发生的情况下)，will和be going to可以互换。
例如：It
will / is going to be a rainy day tomorrow. 但在其他情况下，be going to更强调计划性，而will着重表达 个人意愿或想法。例如： He is going to spend his vacation in Hawaii. I will give you the information when I get it. 注意： there be结构的一般将来时常用There is /are going to be或 There will be表示。 e.g. There is going to / will be a film this evening.
1. I visited the Giant’s Causeway two years ago. 2. It produces electricity for millions of people in China. 3. I’ve never seen it, so I’m not sure I agree with you.
现在完成时还表示某个状态从过去某个时间开始，一直持续 到现在。例如：I have lived here for a long time. 注意：have been to 曾去过某地, 表示一种经历 have gone to 到某地去了 e.g. My father has been to Shanghai twice. Mr Wang isn’t here. He has gone to Dalian.

北师大版九年级数学上册1.3.2正方形的判定课件(共17张PPT)_2

北师大版九年级数学上册1.3.2正方形的判定课件(共17张PPT)_2
怎样判定一个平行四边形是正方形？
既是矩形又是菱形的四边形是正方形．
细心引导 探究新知
怎样判定一个矩形是正方形？怎样判定一个菱形是 正方形？
怎样判定一个平行四边形是正方形？
既是矩形又是菱形的四边形是正方形．
矩形
怎样判定一个矩形是正方形？怎样判定一个菱形是
例2：如图，在矩形ABCD中，BE平分∠ABC，CE平分∠DCB，BF∥CE，CF∥BE。
∴∠EBC=2 ∠ABC=45°∠ECB2= ∠DCB=45° F
∴ ∠EBC∠ECB ∴EB=EC
□ BECF是菱形（菱形的定义）
△EBC中∠EBC=45°∠ECB=45°
∴∠BEC=90°
∴菱形BECF是正方形（有一个角是直角的菱形是正方形）
变式探究 在△ABC中,AB=AC,D是BC的中
点,DE⊥AB,DF⊥AC,垂足分别是E,F.
选做5、如图，四边形ABCD和DEFG都是正
方形，试说明AE=CG
A
D
解：因为四边形ABCD是正方形，
根据正方形的四边相等，得 AD=CD.
又知四边形DEFG也是正方形，
所以DE=DG. 又因为正方形的每个内角为90°， B
E F
G C
所以∠ADE＋∠EDC＝∠CDG＋∠EDC.
所以∠ADE＝∠CDG.
1)求证：DE=DF
2)只添加一个条件,使四边形EDFA是正方形.
请你至少写出两种不同的添加方法.(不另外
添加辅助线,无需证明)
A
E
F
B
D
C
合作交流
1. 已知:正方形ABCD中，点E、F 、 G 、 H分别在 AB、BC、CD、DA上，且AE=BF=CG=DH，试 判断四边形EFGH是正方形吗?为什么?

北师大版九年级数学(上册)《1.3正方形的性质与判定(一)》课件(共23张PPT)

北师大版九年级数学(上册)《1.3正方形的性质与判定(一)》课件(共23张PPT)

变式练习
1、如图，点E、F在正方形ABCD的边 BC、CD上，BE=CF.
（1）AE与BF相等吗？为什么？
（2）AE与BF是否垂直？说明你的理由。
A
D
F G
BE
C
2．如图(5)，在AB上取一点C，以AC、 BC为正方形的一边在同一侧作正方形 AEDC和BCFG连结AF、BD延长BD交AF 于H。 求证：(1) △ACF≌△DCB
平行四边形，矩形，菱形，正方形的关系
平行四边形
正
矩形 方 菱形
形
正方形是特殊的平行四边形，也是特殊的矩 形，也是特殊的菱形。
性
边
角
质 对角线
对称性
图A
DA
∟
∟D A
D
形 语
O
轴 对
言B
CB
∟
∟
CB
C
称 图
文
对角线互相垂直 形
字 语
对边平行，
四条边都 相等
四个角 都是直角
平分且相等，每 条对角线平分一
PF⊥BD于F,则PE+PF=______5________. A
E
D
分析：PE=AE，PF=OE
P
O
PE＋PF＝OA
3.正方形ABCD中，M为AD中点， ME⊥BD于E，MF⊥AC于F,若
ME+MF =8cm，则AC=___1_6_c_m__.
F
B A
MC D
F
E
O
B
C
知识回顾 Knowledge Review
正方形的性质与判定
想一想：正方形是怎样的矩形？
正方矩形形
邻边相等 的矩形
想一想：正方形是怎样的菱形？

2018年秋九年级北师大版数学上册课件：第三章综合检测题 (共27张PPT)

2018年秋九年级北师大版数学上册课件：第三章综合检测题 (共27张PPT)
解：(1)290×219＝10(个)，290－10＝280(个)，(280－40)÷(2＋1)＝80(个)，280 －80＝200(个)．故袋中红球的个数是 200 个；
(2)80÷290＝289.答：从袋中任取一个球是黑球的概率是289.
21．(8 分)A、B、C 三人玩篮球传球游戏，游戏规则是：第一次传球由 A 将 球随机地传给 B、C 两人中的某一人，以后的每一次传球都是由上次的传球 者随机地传给其他两人中的某一人． (1)求两次传球后，球恰在 B 手中的概率； (2)求三次传球后，球恰在 A 手中的概率．
24．(白银中考)(10 分)在一次数学兴趣小组活动中，李燕和刘凯两位同学设 计了如图所示的两个转盘做游戏(每个转盘被分成面积相等的几个扇形，并 在每个扇形区域内标上数字)．游戏规则如下：两人分别同时转动甲、乙转 盘，转盘停止后，若指针所指区域内两数和小于 12，则李燕获胜；若指针 所指区域内两数和等于 12，则为平局；若指针所指区域内两数和大于 12， 则刘凯获胜(若指针停在等分线上，重转一次，直到指针指向某一份内为止)． (1)请用列表或画树状图的方法表示出上述游戏中两数和的所有可能的结 果；(2)分别求出李燕和刘凯获胜的概率．
7 个数，抽到偶数的概率为 11 . 18．一个不透明的口袋里装有除颜色外，其余都相同的 5 个白球和若干个红 球，在不允许将球倒出来数的前提下，小亮为了估计其中的红球数，采用如 下方法：先将口袋中的球摇匀，再从口袋里随机摸出一球，记下颜色，然后 把它放回口袋中，不断重复上述过程，小亮共摸了 100 次，其中有 10 次摸 到白球，因此小亮估计口袋中的红球大约有 45 个．
摸出白球，据此估计袋中黑球有( C )
A．15 个
B．16 个
C．17 个
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American jazz.
C. They can enjoy the pleasure of the ferry and see the fantastic city nights.
D. They can enjoy waltz in Hong Kong. (D )5. Which of the following is TRUE according to the material? A. You need to spend $60 learning waltz. B. You can enjoy American jazz at Rainbow Jazz Club in the morning. C. You can go to Heibei Museum to look at the show every day except weekends. D. You can watch good movies in Hong Kong. (B) In some countries, the most common unlucky number is thirteen. People don’t like to live in a house that is number 13. People don’t like to have parties with thirteen people. People don’t like to do important things on the thirteenth of the month. Also, when you add the Japanese unlucky
根据短文内容，选择正确答案。 ( A )1. If you want to enjoy jazz, you should call _________. A. 88564822 B. 88656662 C. 88655468 D. 88656886 (A )2. Hebei Museum opens _______ hours a week. A. 18 B. 40 C.58 D. 68 (D )3. If Jack wants to be an excellent dancer when he grows up, he should go to ___. A. Rainbow Jazz Club B. Blue Sky Theater C. Hebei Museum D. Hong Kong (B )4. What can visitors do in Hong Kong according to the material? A. They can enjoy real American jazz and the pleasure of the ferry. B. They can see something about Shenzhou VII and enjoy real
Live Music -----Jazz Enjoy real American jazz, one of the most famous trumpet shows. Place: Rainbow Jazz Club Date: April 8----April 22 Time: 7:30 a.m. -------5:00 p.m. Price: $ 80 Telephone:88656662
An Exciting Trip Have your wonderful trip! You will enjoy the pleasure of the ferry and see the fantastic city nights. Place: Hong Kong Date: May 1—May 6 Price: $170 a day Telephone: 88564822
Live Music -----Jazz Enjoy real American jazz, one of the most famous trumpet shows. Place: Rainbow Jazz Club Date: April 8----April 22 Time: 7:30 a.m. -------5:00 p.m. Price: $ 80 Telephone:88656662
An Exciting Trip Have your wonderful trip! You will enjoy the pleasure of the ferry and see the fantastic city nights. Place: Hong Kong Date: May 1—May 6 Price: $170 a day Telephone: 88564822
An Exciting Trip Have your wonderful trip! You will enjoy the pleasure of the ferry and see the fantastic city nights. Place: Hong Kong
An Exciting Trip Have your wonderful trip! You will enjoy the pleasure of the ferry and see the fantastic city nights. Place: Hong Kong
(B )11.What did you ________? A. talk to B. talk about C. talk with D. talk back (A )12.Jin Yong is one of the greatest and oldest ______ writers. He is still _______. A. living, alive B. living, living C. alive, living D. alive, alive (A)13.She can speak Chinese, English and ______ French. A. a little B. a few C. few D. little (A)14.–Laura, we’ve decided _______ on a trip this afternoon. Will you join us? -- I’m afraid not. I have a composition _________. A. to go, to write B. to go, writing B C. going, to write D. going, writing ( )15.Every year millions of trees ______ to prevent floods, droughts and sandstorms.
Live Music -----Jazz Enjoy real American jazz, one of the most famous trumpet shows. Place: Rainbow Jazz Club Date: April 8----April 22 Time: 7:30 a.m. -------5:00 p.m. Price: $ 80 Telephone:88656662
(D )16.Sorry, I can’t work out this problem. It’s ____________ difficult. A. less B. little C. too much D. much too (D )17.__________? –I have a headache. A. What’s problem B. What’s the wrong C. What’s trouble D. What’s up (A )18.The policeman saw me ________ the red light without stopping. A. passing B. pass C. passed D. to pass ( D )19.I would like to buy a house---- modern, comfortable, and __________ in a quiet place. A. first of all B. after all C. in all D. above all ( C)20.Your sister as well as you _______ a student. A. be B. am C. is D. are
practice it on weekends. A. needn’t B. need
C. can’t
D. can
( B )6.–How much will you be paid? --Judy, I don’t do it for money, but for experience. _______, it’s voluntary(志愿的) work. A. However B. Besides C. Finally D. Possibly ( C )7.–This box is ______ heavy for me to carry. Can you help me? --Certainly. A. so B. much C. very D. too (D )8.______ a player, I’m looking forward ________ the next Olympic Games. A. For, at B. As, to C. With, for D. Of, to ( B )9. – I called you yesterday evening, but there was no answer. (C )10.She ought to(应该) stop _______, she has a headache because she _______ too long. A. to work, was working B. to work, has read C. working, has read D. wusic -----Jazz Enjoy real American jazz, one of the most famous trumpet shows. Place: Rainbow Jazz Club Date: April 8----April 22 Time: 7:30 a.m. -------5:00 p.m. Price: $ 80 Telephone:88656662