（2-3）×
【答案】分析：觀察，可以首先把括號(hào)內(nèi)的化簡，合并同類項(xiàng)，然后相乘．
解答：解：原式=（4×=3×=9．
點(diǎn)評(píng)：本題考查的是二次根式的混合運(yùn)算，在進(jìn)行此類運(yùn)算時(shí)一般先把二次根式化為最簡二次根式的形式后再運(yùn)算．
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：初中數(shù)學(xué) 來源： 題型：

（2012•天門）Lost time is never found again（歲月既往，一去不回）．在這句諺語的所有英文字母中，字母“i”出現(xiàn)的頻率是
0.12
0.12
．

查看答案和解析>>

科目：初中數(shù)學(xué) 來源： 題型：閱讀理解

The Internet has become part of teenage life. There’s a report on 3,375 students aged from 10 to 18 in seven Chinese cities. It says that 38% of them believe they use the Internet often. While most of them get useful information and use the Internet to help in their studies, some are not using it in a good way. Many are playing online games too much. A few even visit Web sites they should not look at. Bad things can happen if young people spend too much time on the Internet.
In order to help young people use the Internet in a good way, a textbook on good Internet behavior has started to be used in some Shanghai middle schools this term. It uses real examples to teach students all about good ways of using the Internet. Some students also make online friends. But if you are meeting a friend offline, let your parents know.
Teachers and parents all think the book is a very good idea. It will teach students how to be a good person in the online world. It will be a guide for teens using the Internet and keep students away from bad sites.
【小題1】The underlined word “it” means_____?
A. the book  B. the report  C. the Internet
【小題2】From the report, about____ students between 10—18 years old  
in the seven cities use the Internet often.
A. 3,375   B. 1,280   C. 2,100   
【小題3】 What do most of the students do on the Internet?
A. They get useful information to help in their studies.
B. They play online games.
C. They make online friends.
【小題4】Why do teachers and parents think the book is a good idea?
A. Because it helps with the students’studies.
B. Because it is used in Shanghai middle schools.
C. Because it teaches students how to use the Internet in a good 
way.
【小題5】Which is  the best title for the passage?
A. The Internet is very useful.
B. Students can't use the Internet.   
C. Be careful when using the Internet.

查看答案和解析>>

科目：初中數(shù)學(xué) 來源： 題型：閱讀理解

Now you’ve finished three years of English study. There’s one way to demonstrate(展示)what you’ve learned-take a test!
Do you have any special methods(方法) you use to help you do better on a test? How well you do is often a matter of how well prepared you are. Here are some ways to make sure you’re at your best on test days.
Go to bed early. The night before a test is not the time to stay up watching TV. You want to be rested and wide-awake for test day.
Have a good breakfast. Test day isn’t a morning for donuts(面包圈).Nor is it a time to starve yourself. Eat plenty of low-sugar, high-energy food to keep your brain and body working their best.
Be prepared, Make sure you have two pencils and anything else you were asked to bring.
Watch the numbers. Make sure that the number of the items(項(xiàng)目)on your answer sheet matches the number of the question.
Look over all the answer choices(選擇). Don’t assume(假定)that choice A is correct until you’ve checked the others. You may find a better one. And it is wrong to eliminate(排除)any choice that you can see at once. You’ll have a better chance of finding the right answer.
Check the clock. Make sure you allow yourself enough time to answer every question and go back and check your answers .Don’t spend too much time on any difficult question .Skip(跳讀)it and come back to it later.
Keep up with your school work all year long That’s how you get the skills you need for taking tests.
四、填寫表格，每空一詞（10分）
How to make sure that you can do     1 on test days
   2 
Things you do
Going to bed early
Not 3  up or being asleep for test day
Having a good breakfast
Eating  4   low-sugar, high-energy food
Being prepared
Remembering to  5  two pencils and
the    6 things you were asked to bring
Watching the numbers
The number of your answer should   7  the number of the question
Looking over all the choices
Don’t assume that the choice A is correct   8    
you’ve checked the others
Checking the clock
  9  your time carefully and not spending too much on any difficult question
You will get the skills you need    10   you keep up with your schoolwork all year long
 

查看答案和解析>>

科目：初中數(shù)學(xué) 來源： 題型：閱讀理解

任務(wù)型閱讀：（10分）
Almost everyone likes dogs, and almost everyone likes reading stories about dogs.
I have a friend. (1)The friend has a large police dog. Its name is Jack. Police dogs are very clever. Every Sunday afternoon my friend takes Jack for a long walk in the park, Jack likes these long walks very much.
One Sunday afternoon a young man came to visit my friend. He stayed for a long time. He talked and talked. Soon it was time for my friend to take Jack for his walk. But the visitor still stayed. Jack became very worried. He walked around the room several times and then sat down in front of the visitor and looked at him. (2)but, paid, the, visitor, attention, the, to, dog, no. He continued talking.
(3) Finally Jack couldn’t stand（忍受） it any more. He went out of the room and came back a few minutes later. He sat down again in front of the visitor but this time he held the visitor’s hat in his mouth and ran out of the room.
1.將（1）處合并成一個(gè)簡單句：
_________________________________________________
2將（2）句按正確的順序?qū)懗鰜恚?br />                                                    
 
3. 將（3）句翻譯成中文：_____________________________________
4. Why did the dog hold the visitor’s hat in the mouth?
Because it’s time for it _________ _________ with its master.
5. The best title of the story is _______.
A．My friend and his dog.B．A clever dog.
C．A guest who likes talking.D．How to keep a police dog.

查看答案和解析>>

科目：初中數(shù)學(xué) 來源：2012年初中畢業(yè)升學(xué)考試（湖北天門、仙桃、潛江、江漢油田卷）數(shù)學(xué)（解析版） 題型：填空題

）Lost time is never found again（歲月既往，一去不回）．在這句諺語的所有英文字母中，字母“i”出現(xiàn)的頻率是　 ▲ 　．

 

查看答案和解析>>

同步練習(xí)冊(cè)答案