试题与答案

设等差数列{an}的前n项和为Sn,且S4=-62,S6=-75,求: (1){

题型:解答题

题目:

设等差数列{an}的前n项和为Sn,且S4=-62,S6=-75,求:

(1){an}的通项公式an及其前n项和Sn

(2)|a1|+|a2|+|a3|+…+|a14|.

答案:

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参考答案:C

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     While it is impossible to live completely free of stress, it is possible to prevent stress as well as reduce

its effect when it can't be avoided. The US Department of Health and Human Services offers the following suggestions for ways to deal with stress.

     ◆Try physical activity

     When you are nervous, angry or upset, try releasing the pressure through exercise or physical activity. Running, walking, playing tennis, and working in your garden are just some of the activities you might try.

     ◆Take care of yourself

     You should make every effort to eat well and get enough rest. If you easily get angry and can't sleep

well enough, or if you're not eating properly, it will be more likely that you will fall into stressful situations

. If stress repeatedly keeps you from sleeping, you should consult a doctor.

     ◆Make time for yourself

     Schedule time for both work and entertainment. Don't forget, play can be just as important to your

overall well-being as work. You need a break from your daily routine to just relax and have fun. Go

window-shopping or work on a hobby. Allow yourself at least a half hour each day to do something you

enjoy.

     ◆Make a list of things to do

     Stress can result from disorganization and a feeling that "there's so much to do, and not enough time".

Trying to take care of everything at once can be too much for you and as a result, you may not achieve

anything. Instead, make a list of everything you have to do, then do one thing at a time, checking off each

task as it is completed. Set out to do the most important task first.

1.Which of the following statements shows that you have fallen into stressful situations?

A. You can't sleep well all the time.        

B. You have a break after work.

C. You always feel happy and relaxed.      

D. You only do one thing at a time.

2. According to the passage, how do you make a list of things to do?

A. Try to take care of everything at once.    

B. Do one thing at a time.

C. Only do the most important thing.      

D. Have a break from your work.

3. Why does the writer write this passage?

A. To give opinion.    

B. To give suggestions.

C. To make a request.  

D. To ask for advice.

4.What is the best title for the passage?

A. How to Deal with Stress?              

B. How to Make Time for Yourself?

C. How to Take Care of Yourself?        

D. How to Make a List of Things to Do?

5.Which of the following would be the advice to deal with stress according to the passage?

A. just lie in bed for a rest        

B. always listen to pop music

C. insist on doing work        

D. make a list to do things one by one

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