！！！！！Who has a New Year s Day experience?!!!!! 5

Call for Essays from Expo Volunteers.

Students! The curtain of the Olympic Games has fallen, the footsteps of the 2010 World Expo are getting closer and closer, and the call for civilization and harmony is still in our ears. The Shanghai World Expo will be a grand event for human urban life; It is also a grand meeting of people all over the world, it is a symphony with "innovation" and "integration" as the main theme; It will be a wonderful dialogue of human civilization.

As students living and studying in Shanghai, we should actively devote ourselves to the upsurge of the World Expo with full spirit and enthusiasm, and make our due responsibilities and obligations for the complete success of the World Expo and the construction of Shanghai into an international metropolis.

First of all, we should deeply understand the great significance of running the World Expo well, and we should publicize the Expo with our own practical actions. Actively participate in all kinds of colorful publicity activities held to welcome the World Expo, such as the World Expo Publicity Day, the World Expo knowledge quiz in the class, in the form of sending a "World Expo Civilization Card" to the community and parents, and carrying out the activities of "Small Hands Holding Big Hands, Everyone Looking for Bad Habits", etc., to create a strong atmosphere to welcome the World Expo, and to infect and drive more people to understand the Expo, participate in the Expo, and support the Expo.

Secondly, we should always pay attention to civilized self-cultivation, enthusiasm and courtesy, and improve quality, both inside and outside the campus, we should respect teachers and teachers, love and help each other, from tidying up their own appearance to beautifying the campus environment, from showing civilized etiquette to mutual assistance and cooperation between students, and actively create a civilized and harmonious campus cultural atmosphere. Outside the campus, civilized and polite, enthusiastic about public welfare, from assisting in maintaining public order to helping guests at home and abroad understand Shanghai, from caring for the city's appearance to standardizing language and behavior, and strive to understand responsibility, love and dedication.

In 2010, the world will give Shanghai five months, we should carry forward the volunteer spirit of participating in the Olympic Games and dedicating to the Olympic Games, and do our best to devote ourselves to the volunteer service action of the World Expo. Diligent in learning, good at creating, willing to contribute, with the spirit of "unity, fraternity, mutual assistance, and progress", earnestly assume the responsibilities and missions entrusted by the times, make the youth smile the most beautiful expression of volunteers, and make volunteer action one of the highlights of serving the Expo.

The World Expo will be held in Shanghai, which is not only the glory of the 20 million people of Shanghai, but also the pride of the 1.3 billion Chinese sons and daughters, which is the pride of all the descendants of Yan and Huang. While feeling this pride and pride, we should also feel deeply about the responsibility on our shoulders. When the time comes, we will open our hearts and show the civilization and friendliness of the ancient Chinese country, so that the world can see the changes and growth of China.

Students, let us take action immediately, start from now, start from our side, start from small things, participate in the Expo, serve the Expo, and contribute to the Expo, and jointly shape our good image of civilization, friendliness, integrity, tolerance, active practice, and dedication. Grow with the World Expo, develop with the city, and progress with the motherland!

1 The function f(x)=x +bx+c,f(x+1)=f(-x),f[(1 2)+(1 2+x)]=f[(1 2)-(1 2+x)] The function f(x) satisfies f(1 2+x)=f(1 2-x), that is, the function image is symmetrical with respect to the line x=1 2, f(2)=f(-1), and it can be seen from the positive coefficient of the quadratic term, that the function f(x) is a subtraction function on ( 1 2], -2<-1<0，f(-2)>f(-1)=f(2)>f(0)；

Note: Is it "f(x+1)=f(-x)" or "f(x+1)=f(1-x)"?If the latter, the answer: f(-2)>f(0)=f(2)

2 Let x1, x2 r, and x2=x1+ x, x>0, then when x10, f(x)<0 is constant, and x>0, f( x)<0, i.e., f(x2)-f(x1)<0, f(x2) function f(x) is a subtraction function on r.

f(x+1)=f(-x), which means that the function is symmetrical with respect to the line x=1 2, so b=-1, f(-2)=7+c, f(0)=c, f(2)=2+c

f(-2)>f(2)>f(0)

arbitrarily take af(b)=f(b-a+a)=f(b-a)+f(a)f(b)-f(a)=f(b-a) b-a<0,f(b-a)<0f(b)-f(a)<0

f(b) and f(x) are subtractive functions.

1.Knowing the function f(x)=x +bx+c, x=-1 or 1 can be taken, using the characteristic f(x+1)=f(-x), it is: f(0)=f(1).1)f(2)=f(-1)..2)

Then we get: c=1+b+c....3)

4+2b+c=1-b+c...4) The simultaneous solution has:

b=-1c, whichever is any.

Then the parsing becomes: f(x)=x -x+c

Then it is easy to obtain: f(-2)=6+c

f(0)=c

f(2)=2+c

Apparently there are: f(-2)> f(0)> f(2).

2.The domain of the function y=f(x) is r, and for any a, b r has :

f(a+b)=f(a)+f(b)

So, there is: f(x)=f(x+0)=f(x)+f(0) to get: f(0)=0

If we continue to have: f(x)=f(z-x)=f(x)+f(-x)=0 then we get:

f(-x)=-f(x), which is a typical odd function.

And when x>0, f(x)<0 is constant; Conversely, when x<0, f(x)>0 is constant; It is proved according to the above formula.

Wow! We just did it, but alas, I won't