The problem of ideological fluctuations of freshmen in high school is in urgent need of help!! The s

In fact, the liberal arts and science classes are not as serious as you think. I want to tell you that now you have to concentrate on learning your knowledge, and it will be a natural thing for you to divide your classes in the future. Liberal arts focus on memorizing a lot of things, and geography is difficult.

I understand more science. Now you don't need to think about that, it's just a freshman in high school. Over time, you will have a very clear idea of what you have on your own. So why waste time on things that haven't happened, and concentrate on every subject you are studying. Come on!

There is a book called "Living in the Moment" that you can look for.

In addition, if you really want to move forward in science, then you have to strengthen your "logic" first; Start analyzing yourself now!

When you can't use it for two purposes, first distinguish your "problem" into "light, heavy, slow, and urgent", and then gradually solve it, which is also the basic kung fu that must and will be used after leaving the society in the future. Don't be distracted by other things, and if you do it in an organized way, you will be able to bring yourself into a clearer direction.

You think too early, in fact, your main purpose now is to lay a good foundation, and then choose according to your strengths, there is no need to worry now, studying hard is your main job now, don't think so much, come on!

Why do you want to do so much! I'm here! Just study with your heart. The boat is naturally straight to the bridge.

Since 3x 2-y 2=2x 2+2xy+2y 2, 2x 2-2y 2=x 2+2xy+y 2, i.e. 2(x+y)(x-y)=(x+y) 2

When x≠-y, 2x-2y=x+yx=3y, it brings back the original equation of the balance of matter. Find the block code to get y=(4 13).

When x+y=0, x=2 y=-2 or x=-2 y=2

1. f(3+x)=f(3-x): axis of symmetry x=3The minimum value of this function is -3: let the function be:

y=a(x-3) -3 has two intersections with the x-axis, and the distance between them is 4: these two intersections are: (1,0), (5,0).

0=a(1-3)²-3

a=3 4 The function is: y=3 4(x-3) -3

2. Let ab=x 0=-2

x-2)²>=2

2- 2=4, with the vault as the coordinate origin, the horizontal direction as the x-axis, and the vertical direction as the y-axis to establish the coordinate system.

The parabola passes through the vertex (0,0), (4,-5), (4,-5).

Let the parabolic equation be y=ax

5=a(-4)²

a=-5/16

y=-5/16x²

Wooden boat beam 4 m: x = 2

y=-5/16*2²

y=-5/4

5/4|<2=High.

When the water rises to the distance between the parabolic vaults 5 4 = meters, the wooden boat begins to be unnavigable5, and the problem is problematic and cannot be solved.

1.(1) f(3+x)=f(3-x), so the axis of symmetry of the function = 3, the image has two intersection points with the x-axis, and the distance between them is 4

Then the two intersections of the function on the x-axis are (1,0), (5,0), so f(x)=a(x-1)·(x-5), the minimum value =-3 so f(3)=-3 i.e., a(3-1)·(3-5)=-3, so a=3 4

The analytic formula f(x)=3 4(x-1)(x-5), so in (- 3) monotonically decreasing, (3,+ monotonically increasing.

2.You need a diagram, otherwise you can't guess which side of the triangle PR is.

3.Same as the first question, the intersection of x-axis 2 is (-1,0),(5,0) 4a+2b+c=-9 ,a(2+1)(2-6)=-9,a=3 4 ,b=-15 4,c=-9 2 Let's take it by yourself by listing an inequality.

Because f(-3) = f(3), x 2+3 3, so f(x 2+3) f(-3).

These three are equations for three circles.

Freshman math to solve the game! Solution: (1) The function grip f(x)=log2(4x+1)+kx(k chunpilet r) is an even function f(-x)=log2(4-x+1)-kx=f(x)=log2(4x+1)+kxhengcheng immediately log2(4x+1...).