||||2005-2006|-2007|-2008|-2009|

＝(1+2007)*2007/2=2015028
过程是有公式,首项加尾项乘以项数除以2

(1-2-3+4)+(5-6-7+8)+.+(2005-2006-2007+2008)=0
2008/4=502可以被除尽
所以最后=0哈

2006*2006+2005*2005-2006*2005-2005*2004
=2006*2006-2006*2005+2005*2005-2005*2004
=2006*（2006-2005）+2005*（2005-2004）
=2006*1+2005*1
=2006+2005
=4011

2007*2005-2006*2004
=(2006+1)(2006-1)-(2005+1)(2005-1)
=2006^2-1-2005^2+1
=2006^2-2005^2
=(2006+2005)(2006-2005)
=4011

=(1-2)+(3-4)+(5-6)+(7-8)……+(2005-2006)+(2007-2008)+(2009-2010)
=-1-1-1-1-.-1-1
=-1*1005
=-1005

解题思路：观察算式的规律，从左到右每四个数组成的和为0，可知整个算式的和为0．

原式=（1-2-3+4）+（5-6-7+8）+…+（2005-2006-2007+2008），
=0+0+…+0，
=0．
故答案为：0．

点评：
本题考点： 有理数的加减混合运算．

考点点评： 本题考查了有理数的加减混合运算，关键是寻找抵消规律．

四项为0,2008能被4整除,所以结果为0.

2004*2005-2006*2005
=（2004-2006）*2005
=-2*2005
=-4010

=-1+（-1）+（-1）+.+（-1）+2009（共1004个-1）
=-1004+2009
=1005

1+3+5+...2007-(2+4+...+2006)=(1+2007)*1003/2-(2+2006)*1002/2=1004*(1003-1002)=1004

4个等于0 2008正好是4的倍数 结果等于0

最后结果是2015028
原式=1+(3-2)(3+2)+(5-4)(5+4)+(7-6)(7+6)+``````+(2007-2006)(2007+2006)
=1+5+9+13+17+······+4013
=1+2x2+1+2x4+1+2x6+1+2x8+1+······+2x2006+1
=1004+2x(2+4+6+8+······+2006)
=1004+4x(1+2+3+4+······1003)
=1004+4x(1+1003)x1003/2
=1004+1004x2006
=1004x2007
=2015028

1-2+3-4+5-6+7-8+.+2005-2006+2007-2008+2009-2010
=(1-2)+(3-4)+(5-6)+(7-8)+.+(2005-2006)+(2007-2008)+(2009-2010)
你可以看到每个括号里都是等于-1,且总共有2010/2=1005个
所以=-1*1005=-1005

原式=2007*（2004+1）-2006*2004
=2007*2004+2007-2006*2004
=（2007-2006）*2004+2007
=2004+2007
=4011

　　高一化学方程式总结（一）
　　1、硫酸根离子的检验:BaCl2 + Na2SO4 = BaSO4↓+ 2NaCl
　　2、碳酸根离子的检验:CaCl2 + Na2CO3 = CaCO3↓ + 2NaCl
　　3、碳酸钠与盐酸反应:Na2CO3 + 2HCl = 2NaCl + H2O + CO2↑
　　4、木炭还原氧化铜:2CuO + C 高温 2Cu + CO2↑
　　5、铁片与硫酸铜溶液反应:Fe + CuSO4 = FeSO4 + Cu
　　6、氯化钙与碳酸钠溶液反应：CaCl2 + Na2CO3 = CaCO3↓+ 2NaCl
　　7、钠在空气中燃烧：2Na + O2 △ Na2O2
　　钠与氧气反应：4Na + O2 = 2Na2O
　　8、过氧化钠与水反应：2Na2O2 + 2H2O = 4NaOH + O2↑
　　9、过氧化钠与二氧化碳反应：2Na2O2 + 2CO2 = 2Na2CO3 + O2
　　10、钠与水反应：2Na + 2H2O = 2NaOH + H2↑
　　11、铁与水蒸气反应：3Fe + 4H2O(g) = F3O4 + 4H2↑
　　12、铝与氢氧化钠溶液反应：2Al + 2NaOH + 2H2O = 2NaAlO2 + 3H2↑
　　13、氧化钙与水反应：CaO + H2O = Ca(OH)2
　　14、氧化铁与盐酸反应：Fe2O3 + 6HCl = 2FeCl3 + 3H2O
　　15、氧化铝与盐酸反应：Al2O3 + 6HCl = 2AlCl3 + 3H2O
　　16、氧化铝与氢氧化钠溶液反应：Al2O3 + 2NaOH = 2NaAlO2 + H2O
　　17、氯化铁与氢氧化钠溶液反应：FeCl3 + 3NaOH = Fe(OH)3↓+ 3NaCl
　　18、硫酸亚铁与氢氧化钠溶液反应：FeSO4 + 2NaOH = Fe(OH)2↓+ Na2SO4
　　19、氢氧化亚铁被氧化成氢氧化铁：4Fe(OH)2 + 2H2O + O2 = 4Fe(OH)3
　　20、氢氧化铁加热分2Fe(OH)3 △ Fe2O3 + 3H2O↑
　　21、实验室制取氢氧化铝：Al2(SO4)3 + 6NH3•H2O = 2Al(OH)3↓ + 3(NH3)2SO4
　　22、氢氧化铝与盐酸反应：Al(OH)3 + 3HCl = AlCl3 + 3H2O
　　23、氢氧化铝与氢氧化钠溶液反应：Al(OH)3 + NaOH = NaAlO2 + 2H2O
　　24、氢氧化铝加热分2Al(OH)3 △ Al2O3 + 3H2O
　　25、三氯化铁溶液与铁粉反应：2FeCl3 + Fe = 3FeCl2
　　26、氯化亚铁中通入氯气：2FeCl2 + Cl2 = 2FeCl3
　　27、二氧化硅与氢氟酸反应：SiO2 + 4HF = SiF4 + 2H2O
　　硅单质与氢氟酸反应：Si + 4HF = SiF4 + 2H2↑
　　28、二氧化硅与氧化钙高温反应：SiO2 + CaO 高温 CaSiO3
　　29、二氧化硅与氢氧化钠溶液反应：SiO2 + 2NaOH = Na2SiO3 + H2O
　　30、往硅酸钠溶液中通入二氧化碳：Na2SiO3 + CO2 + H2O = Na2CO3 + H2SiO3↓
　　31、硅酸钠与盐酸反应：Na2SiO3 + 2HCl = 2NaCl + H2SiO3↓
　　32、氯气与金属铁反应：2Fe + 3Cl2 点燃 2FeCl3
　　33、氯气与金属铜反应：Cu + Cl2 点燃 CuCl2
　　34、氯气与金属钠反应：2Na + Cl2 点燃 2NaCl
　　35、氯气与水反应：Cl2 + H2O = HCl + HClO
　　36、次氯酸光照分2HClO 光照 2HCl + O2↑
　　37、氯气与氢氧化钠溶液反应：Cl2 + 2NaOH = NaCl + NaClO + H2O
　　38、氯气与消石灰反应：2Cl2 + 2Ca(OH)2 = CaCl2 + Ca(ClO)2 + 2H2O
　　39、盐酸与硝酸银溶液反应：HCl + AgNO3 = AgCl↓ + HNO3
　　40、漂白粉长期置露在空气中：Ca(ClO)2 + H2O + CO2 = CaCO3↓ + 2HClO
　　41、二氧化硫与水反应：SO2 + H2O ≈ H2SO3
　　42、氮气与氧气在放电下反应：N2 + O2 放电 2NO
　　43、一氧化氮与氧气反应：2NO + O2 = 2NO2
　　44、二氧化氮与水反应：3NO2 + H2O = 2HNO3 + NO
　　45、二氧化硫与氧气在催化剂的作用下反应：2SO2 + O2 催化剂 2SO3
　　46、三氧化硫与水反应：SO3 + H2O = H2SO4
　　47、浓硫酸与铜反应：Cu + 2H2SO4(浓) △ CuSO4 + 2H2O + SO2↑
　　48、浓硫酸与木炭反应：C + 2H2SO4(浓) △ CO2 ↑+ 2SO2↑ + 2H2O
　　49、浓硝酸与铜反应：Cu + 4HNO3(浓) = Cu(NO3)2 + 2H2O + 2NO2↑
　　50、稀硝酸与铜反应：3Cu + 8HNO3(稀) △ 3Cu(NO3)2 + 4H2O + 2NO↑
　　51、氨水受热分NH3•H2O △ NH3↑ + H2O
　　52、氨气与氯化氢反应：NH3 + HCl = NH4Cl
　　53、氯化铵受热分NH4Cl △ NH3↑ + HCl↑
　　54、碳酸氢氨受热分NH4HCO3 △ NH3↑ + H2O↑ + CO2↑
　　55、硝酸铵与氢氧化钠反应：NH4NO3 + NaOH △ NH3↑ + NaNO3 + H2O
　　56、氨气的实验室制取：2NH4Cl + Ca(OH)2 △ CaCl2 + 2H2O + 2NH3↑
　　57、氯气与氢气反应：Cl2 + H2 点燃 2HCl
　　58、硫酸铵与氢氧化钠反应：（NH4）2SO4 + 2NaOH △ 2NH3↑ + Na2SO4 + 2H2O
　　59、SO2 + CaO = CaSO3
　　60、SO2 + 2NaOH = Na2SO3 + H2O
　　61、SO2 + Ca(OH)2 = CaSO3↓ + H2O
　　62、SO2 + Cl2 + 2H2O = 2HCl + H2SO4
　　63、SO2 + 2H2S = 3S + 2H2O
　　64、NO、NO2的回收：NO2 + NO + 2NaOH = 2NaNO2 + H2O
　　65、Si + 2F 2 = SiF4
　　66、Si + 2NaOH + H2O = Na2SiO3 +2H2↑
　　67、硅单质的实验室制法：粗硅的制取：SiO2 + 2C 高温电炉 Si + 2CO
　　（石英沙）（焦碳） （粗硅）
　　粗硅转变为纯硅：Si（粗） + 2Cl2 △ SiCl4
　　SiCl4 + 2H2 高温 Si（纯）+ 4HCl

四个一组,每组的计算结果是4
一共有2008/4=502组
最终结果就是4*502=2008

简便运算

2006*2006+2005*2005-2006*2005-2005*2004
=2006x(2006-2005)+2005x(2005-2004)
=2006x1+2005x1
=4011

（1-2-3+4）+（5-6-7+8）+…+（2005-2006-2007+2008） 每四项相加得0,结果是0
1+3+5+7+…+99＝（1+99）+（3+97）+……＝25*100＝2500一共25对

等于-2870
负两千八百七十

=-1×（2008÷2）
=-1004

1.由题意得：原式=-1*1*（-1）*1*（-1）*1*（-1）……*（-1）,由式子可以看出,原式每四项就等于1,一共有2005项,2005/4=501…1,所以原式=-1
2.
3.答案选C
原式=（-2）^2008+（-2）^2008*（-2）
=2^2008+2^2008*（-2）
=2^2008(1-2)
=-2^2008

（1-2-3+4）为0
发现以后每4项都是0
一共2008项
2008/4=502 刚好余0
所以刚好分502组
结果为0
如果叫你算到第n项
则用n/4
看最后余几 假设余x
则将最后x项算出来!
因为前面的n-x项刚好是4的倍数 刚好分组完 为0

一、2006÷2=1003
-2007-1003=-3010
二、（-2000-1999+4000-1）+（-5/6-2/3+2/3-1/2）=0+1/3=1/3
三、
四、3+24+1/2=27+1/2

因为-2-3+4+5=4,-6-7+8+9=4,·····-2006-2007+2008+2009=4,（2009-1）/4=502,
故原式=1+4+4+·····4=1+4x502=2009

解题思路：根据题意，可将题干分为“1-2-3+4+5-6-7+8+9-…+2004+2005”和“4017-2006-2007”两部分，可先把第一部分的1去掉，后面的四个数字就组成一组，这样总共用了2005减去1即2004个数字，4个数字一组，共有501个组，且每组里计算的结果都是4，那么就可以计算出2004个数字进行加减的结果，再用结果和第二部分进行计算，即可得到答案．

第一部分共用了2004个数，且4个数字一组，共有：2004÷4=501组，每一组的结果是4，
则：1-2-3+4+5-6-7+8+9-…+2004+2005-2006-2007+4017
=1+（4+5-2-3）+（8+9-6-7）+…（2004+2005-2002-2003）-2006-2007+4017
=1+501×4-2006-2007+4017
=2005-2006-2007+4017
=2005+（4017-2006-2007）
=2005+4
=2009；
答：算式的结果是2009．
故答案为：2009．

点评：
本题考点： 加减法中的巧算．

考点点评： 解答此题的关键是找清算式中的规律，然后进行计算．

-2012
1-2-3+4=0
+5-6-7+8=0
+9-10-11+12=0
+.+2005-2006-2007+2008=0
+2009-2010-2011=-2012

（1）姚明在对阵“超音速”队的四场比赛中，平均每场得分为
.
x 1 =25.25；
姚明在对阵“快船”队的四场比赛中，平均每场得分为
.
x 2 =23.25．
（2）姚明在对阵“超音速”队的四场比赛中得分的方差为s ₁ ² =6.6875；
姚明在对阵“快船”队的四场比赛中得分的方差为s ₂ ² =19.1875．
∵s ₁ ² ＜s ₂ ² ，
∴从得分的角度看，姚明在对阵“超音速”的比赛中发挥更稳定．
（3）姚明在对阵“超音速”队的四场比赛中的综合得分为
p ₁ =25.25+11×1.5+
11
4 ×（-1.5）=37.625；
姚明在对阵“快船”队的四场比赛中的综合得分为
p ₂ =23.25+
51
4 ×1.5+2×（-1.5）=39.375；
∵p ₁ ＜p ₂ ，
∴姚明在对阵“快船”队的比赛中表现更好．

123

1）1-2+3-4+……+2005-2006
=(1-2)+(3-4) 一共有1003组,每和都为-1
=1003x(-1)
=-1003
2) 69+699+6999+69999+699999
=70-1+700-1+7000-1+70000-1+700000-1
=777770-5
=777765

2005-2006七年级上册英语期末测试卷
满分100分,考试时间120分钟
题号 听力部分 笔试部分 总得分
Ⅰ Ⅱ Ⅲ Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ
得分
听力部分（15分）
Ⅰ. 听对话,选答案.（共5小题,每小题1分；满分5分）
你将听到五组对话,每组对话读两遍.请从每小题所给的A、B、C、三个选项中选出最佳答案.
( )1. Where is Liu Mei from?
A. Beijing. B. Shanghai. C. Fujian.
( )2. Is Mary from Cuba?
A. Yes,she is. B. No,she isn’t. C. Yes,she isn’t.
( )3. Who is the teacher?
A. Mr.Li. B. Miss Zhang. C. Mr.Zhang.
( )4. Is Mr.Guo a teacher?
A. Yes,he isn’t. B. No,he isn’t. C. Yes,he is.
( )5. Who is she?
A. Li Mei. B. Maria. C. Li Ping.
Ⅱ. 听短文,写信息.（共5个空,每个空1分；满分5分）
你将听到一篇短文,短文读两遍.请根据短文内容,填写出下面表格中的空缺部分.
Name:Han Meimei English name:Rose
Age:______ From: ______
Class: ______ Grade: ______
School:Kunming Yu Cai High School
Telephone number: ______
Ⅲ. 听短文,填单词.（共5个空,每个空1分；满分5分）
你将听到一篇短文,短文读两遍.请根据短文内容,填写所缺的单词.
I am 1 tomorrow and I want to have a 2 with my classmates.I 3 Zhou Lan and she says,“No problem.” Zhou Lan can play the 4 .She wants to sing 5 tomorrow.
1._______ 2. _______ 3. _______ 4. _______ 5. _______
笔试部分（85分）
Ⅰ. 单项选择.（共15小题,每小题1分；满分15分）
从每小题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项.
( )1. Kitty _______ from Canada.
A. are B. doesn’t C. aren’t D. isn’t
( )2. —What’s this?
—It’s _______.
A. a orange B. an orange C. oranges D. orange
( )3. I don’t know the girl _______.
A. in coat B. on a red coat C. in red D. a red coat
( )4. —Is your father fat or thin?
—_______
A. Yes,he is. B. No,he isn’t.
C. He is fat. D. He doesn’t thin.
( )5. This is _______ cat.
A. her B. hers C. yours D. theirs
( )6. Let me _______ you.
A. help B. to help C. for help D. helping
( )7. We drink _______ in the morning.
A. a cup of bread B. many meat
C. some cake D. a bottle of milk
( )8. Help _______ some apples,please.
A. yourselves of B. yourselves for
C. yourself to D. yourself for
( )9. —_______ are those?
—Twenty yuan.
A. How B. How many C. How old D. How much
( )10. —What’s the time?
—It’s half _______ two.
A. to B. past C. for D. at
( )11. —Thank you very much.
— _______
A. No,thanks. B. All right.
C. OK. D. You’re welcome.
( )12. Can you run over to the store? We need _______ things.
A. a little B. little C. few D. a few
( )13. —Would you like some bread?
—_______
A. Yes, please. B. No, I don’t.
C. Yes, I would. D. No, I wouldn’t.
( )14. This is _______.
A. Jim’s family’s tree B. Jim’s family tree
C. Jim family’s tree D. the tree of Jim’s
( )15. This is a picture _______ my family.
A. on B. at C. of D. in
Ⅱ. 完成句子.（共5小题,每小题1分；满分5分）
根据汉语意思,每空一词（包括缩写形式）,完成译后的英语句子.
1. 她在家里照顾罗斯.
She _______ _______ Rose at home.
2. 为什么不喝点牛奶?
_______ _______ have some milk?
3. 我可以和Maria通话吗?
May I _______ _______ Maria?
4. 这个用英语怎么说?
What’s this _______ _______?
5. 我的妈妈有两只小脚.
My mother has two _______ _______.
Ⅲ. 补全对话.（共10小题,每小题1分；满分10分）
A.根据情景,完成对话.
A： Hi, Mike. How 1 you?
B： Fine, 2 you! And you?
A： I’m fine, 3 . Do you 4 a knife?
B： Yes, I 5 . I have a small one.
1._______ 2. _______ 3. _______ 4. _______ 5. _______
B. 从Ⅱ栏中选出与Ⅰ栏相对应的答语.
Ⅰ Ⅱ
( )1. Are you free this Sunday? A. He is my father.
( )2. Have a nice day! B. He is a farmer.
( )3. Who’s that man? C. Yes, what’s up?
( )4. Let’s go and fly a kite in the park.D. You, too.
( )5. What does the man do? E. That would be very nice.
Ⅳ. 完形填空.（共10小题,每小题1分；满分10分）
阅读下列短文,从每小题所给的A、B、C三个选项中选出最佳选项.
Wei Fang is twelve years old.She 1 a beautiful girl.She is 2 Shanghai and she 3 in No.5 High School.
Wei Fang 4 up at 6∶30 every day in the morning.She 5 breakfast with her parents.She would like milk and bread.She goes to school at 7∶30.Wei Fang is a clever girl.She 6 and dances very well.She often 7 her classmates do their homework.All of her classmates like 8 very much.She 9 her homework at 7∶00 in the evening and 10 to bed at 9∶00.
( )1. A. be B. am C. is
( )2. A. comes B. from C. in
( )3. A. studies B. Study C. studys
( )4. A. get B. Gets C. getting
( )5. A. have B. has C. having
( )6. A. sing B. singing C. sings
( )7. A. helps B. help C. helping
( )8. A. she B. her C. his
( )9. A. does B. do C. begin
( )10. A. go B. goes C. comes
Ⅴ. 阅读理解.（共15小题,每小题2分；满分30分）
(A)
Jane is a student. She likes shopping very much. She wants to buy a red skirt for herself. Today after class, she goes into a shop. In the shop, she buys many things. She buys a blue jacket for her father. It’s only 80 yuan. And she buys a nice hat for her mother. She takes a pair of pants for her little brother for 40 yuan. Then she goes home. She forgets(忘记) to buy a skirt for herself!
根据短文内容,判断句子正（T）误（F）.
( )1. Jane doesn’t like shopping.
( )2. She buys a jacket for her father for 80 yuan.
( )3. She buys a pair of pants for her brother.
( )4. She goes home with many things.
( )5. She buys a red skirt for herself.
(B)
Family Tree
My name is Bill. I’m from England. I am a worker. My wife Ann is a teacher. We have two children, a son and a daughter. Our son’s name is Jim. Our daughter’s name is Sally. They are students. My father’s name is Robby. My mother’s name is Diana. They are old. I have a brother. His name is Robert. He is a worker, too. My wife’s father’s name is Sam. Her mother’s name is Rose. Her sister is Lily. She is a teacher, too.
根据短文内容,完成下面的家谱.
Family Tree

（C）
One Sunday morning, Mr. Brown and his child, Bill, are in a big supermarket(超市). Mr. Brown wants to buy a new blouse for Mrs. Brown. Bill likes oranges and hamburgers a lot. So his father buys two kilos of oranges and hamburgers for him, too. Bill also wants to buy some picture?books and color pencils. There are many things and many people in the supermarket. They are men and women,old and young. They all want to buy something there.
根据短文内容,选择正确答案.
( )1. Mr.Brown goes to the supermarket with ______.
A. Mrs. Brown B. his son C. his father D. his daughter
( )2. Mr.Brown is going to buy a new blouse for ______.
A. Bill’s mother B. Bill
C. his mother D. himself
( )3. Bill likes ______ very much.
A. color pencils B. hamburgers
C. books D. the shop
( )4. The little boy wants to buy ______.
A. some picture?books B. some color pencils
C. clothes and shoes D. A and B
( )5. People in the supermarket are ______.
A. old and young B. boys and girls
C. men and women D. A,B and C
Ⅵ. 书面表达.（共15分）
假如你是Bob,现在在中国四川,请给你的好朋友John写一封信,介绍你在中国四川的情况,不少于50词.开头和结尾已给出.
参考词汇：food, hot, people, friendly, clothes, different, make friends, take photos, happy
Dear John,
I’m in Sichuan now. _________________________________________
__________________________________________________________________
I’m glad to be here.
Yours,
Bob

2005-2006学年度七年级（上）
期末综合测试卷（二）听力文本
Ⅰ. 听对话,选答案.
1. A:What’s her name?
B:Her name is Liu Mei.
A：Where’s she from?
B:She’s from Shanghai.
2. Ma Li:Hello, Maria.
Maria:Hello, Ma Li.
Ma Li:Are you from Cuba?
Maria:Yes, I am.
3. A:Who is this?
B. He is my teacher, Mr.Zhang.
4. A:Is Mr.Guo from the USA?
B:No, he isn’t.
A:Is he a teacher?
B:Yes, he is.
5. A:Is she Li Mei?
B:No, she isn’t. She is Li Ping.
Ⅱ. 听短文,写信息.
Han Meimei is from Yunnan. She is twelve. Her English name is Rose. Now she is in Kunming Yu Cai High School. She is in Class 10, Grade 1. Her telephone number is 6358129.
Ⅲ. 听短文,填单词.
I am free tomorrow and I want to have a picnic with my class mates. I call Zhou Lan and she says,“No problem.” Zhou Lan can play the guitar. She wants to sing songs tomorrow.

2005-2006学年度七年级（上）
期末综合测试卷参考答案
听力部分
Ⅰ. 1～ 5 BACCC
Ⅱ.
Name: Han Meimei English name:Rose
Age: 12 From: Yunnan
Class: 10 Grade: 1
School:Kunming Yu Cai High School
Telephone number: 6358129
Ⅲ. 1. free 2. picnic 3. call 4. guitar 5. songs
笔试部分
Ⅰ. 1～ 5 DBCCA 6～ 10 ADCDB 11～ 15 DDABC
Ⅱ. 1. looks after 2. Why not 3. speak to 4. in English 5. small feet
Ⅲ. A.1. are 2. thank 3. too 4. have 5. do
B.1～ 5 CDAEB
Ⅳ. 1～ 5 CBABB 6～ 10 CABAB
Ⅴ. (A) 1～ 5 F T T F F
(B)

(C) 1～ 5 BABDD
Ⅵ. 范文
Sichuan food is hot and delicious. I like it very much and eat it a lot. Sichuan people are all very friendly to me. Their clothes are different from ours. I make many new friends here. They take me to a lot of good places and take photos for me.We are happy together.

原式＝(1-2-3+4)+(5-6-7+8)+(9-10-11+12)...+(2001-2002-2003+2004)+(2005-2006-2007+2008)
=0+0+0+...+0+0
=0

其实s=1+2+3+...+2006+2007
则s=(1+2007)*2007/2=2015028
可得余数为3

1-2-3+4+5-6-7+8+9-10-11+12+...+2005-2006-2007+2008+2009
=(1-2)+(-3+4)+(5-6)+(-7+8)+(9-10)+(-11+12)+...+(2005-2006)+(-2007+2008)+2009
=-1+1-1+1-1+1+...-1+1+2009
=2009

解题思路：根据题意，可将题干分为“1-2-3+4+5-6-7+8+9-…+2004+2005”和“4017-2006-2007”两部分，可先把第一部分的1去掉，后面的四个数字就组成一组，这样总共用了2005减去1即2004个数字，4个数字一组，共有501个组，且每组里计算的结果都是4，那么就可以计算出2004个数字进行加减的结果，再用结果和第二部分进行计算，即可得到答案．

第一部分共用了2004个数，且4个数字一组，共有：2004÷4=501组，每一组的结果是4，
则：1-2-3+4+5-6-7+8+9-…+2004+2005-2006-2007+4017
=1+（4+5-2-3）+（8+9-6-7）+…（2004+2005-2002-2003）-2006-2007+4017
=1+501×4-2006-2007+4017
=2005-2006-2007+4017
=2005+（4017-2006-2007）
=2005+4
=2009；
答：算式的结果是2009．
故答案为：2009．

点评：
本题考点： 加减法中的巧算．

考点点评： 解答此题的关键是找清算式中的规律，然后进行计算．

1-2-3+4+5-6-7+8+...+2005-2006-2007+2008+2009-2010
=(1-2)+(-3+4)+(5-6)+(-7+8)+...+(2005-2006)+(-2007+2008)+(2009-2010)
=-1+(+1)+(-1)+(+1)+...+(-1)
(一共2010/4=503个-1,502个+1)
=-1

2007-2006x2005-2006+2007x2005
(2007+2007x2005)-(2006x2005+2006)
=2007x2006-2006x2006
=(2007-2006)x2006
=1x2006
=2006

U11-U12:BCACB ACDDA CCADC
U13:ABACB ACDBD DDDCD
U14:CBCDB ADCCC ABCAB
U15:ADACB DAAAB CABDB
U16-U17:AACAC ACBCA BCCAA
U18:DCDBB AACBA ADACB
U19:CCDAC DACAC BDDCA
U20:ADABC BCCDB CBBDA

很高兴能为你解答:
原式=(-1)^1*(-1)^2*(-1)^3(-1)^4*.*(-1)^2005
=(-1)^1*(-1)^3*.*(-1)^2005
=(-1)*(-1)*(-1).*(-1)
=(-1)^1003
=-1
(解释一下1003是如何得到的:应该有(2005-1)/2+1个(-1)相乘,这里涉及等差数列个数问题,等差数列数字个数等于(末项-首项)/差距+1,所以得到1003)
希望下次能在为你效劳,呵呵!

1-2-3+4+5-6-7+8+9-10-11+12+.+2005-2006-2007+2008
=(1-2-3+4)+(5-6-7+8)+(9-10-11+12)+.+(2005-2006-2007+2008)
=0+0+0+.0
=0

(10-11)*(11-12)*（12-13）*.（2005-2006）
=(-1)*(-1)*(-1)*……(-1) （2006-10=1996个-1）
=1

(1-2)+(3-4)+……+(2005-2006)+2007
=(-1)+(-1)+……+(-1)+2007
=(-1)*1003+2007
=1004

- =是1-2-3+4+5-6..

因为1-2=-1,3-4=-1,……2005-2006=-1
所以有一半的-1,就是1003个-1
所以值为-1003
1-2+3-4+...+2005-2006
=（1-2）+（3-4）+...+（2005-2006）
=-1×1003
=-1003

4个一组``
（1-2-3+4）=0.(2005-2006-2007+2008)=0
所以等于0

1+(3-2)+(5-4)+...+(2009-2008)
=1+2008/2
=1005

2007
=-5-5/4-7/3-7/4+9=-5-3-7/3+9=1-7/3=-4/3