Friends, help, I can t write my homework!

The answer to the top question is -1, and the answer to question 11 is -1

The process at the top: n=2m+1 so 2m-n+1=0 so 2m-n= -1

Question 12 The answer is m(2,1).

12 Question Process: y=-x+3=3x-5=y, so -4x=-8x=2 can be substituted into the analytical expression of any one of the two primary functions.

Get y=1 so m(2,1).

Question 13 The answer is double root number 5

13 Question Process: The shortest distance from a point to a straight line is a perpendicular line.

y=2x-4 in k=2

A function has a definition that can be learned in the first year of high school

If two lines are perpendicular, then the k of the two lines is multiplied by =-1

So 2 times the k = -1 of the ab line

So k = of the ab line

Then let the line where ab is located in the shortest time of the line segment ab be y=-1 2x+b, and substitute the point a to find b=-1 2, so the straight line where ab is located in the shortest time of the line segment ab is y=-1 2x-1 2.

Calculate the intersection point between it and the straight line y=2x-4, which is b, and finally b(7 5, -6 5).

There is a formula in high school mathematics.

a(-1,0) b(, so labl=root(root:times,root:5.)

1.-1 2.（2，1） 3.Six-fifths times the root number five.

1) Walking in the forest, the wind blows, breathing the breath of bamboo, and listening to the sound of bamboo leaves.

2) The little bamboo shoots are stretching and yawning!

Different from the original sentence: 1 It is more vivid before the modification 2 It is anthropomorphized before the modification.

If you remove the embellishment, it will make the article stiff and old-fashioned. Words are modified to make the article more vivid.

1. You have an innate bonus to read the answers, and the pen speed is very fast, 2. The pen speed of copying the answers is very fast (you can copy a few wrong questions and correct them in a fake way).

12. The compromise method (which is also the way I studied the theory and the speed of my winter vacation): the answer is on the left, and the homework is on the right.

Do it with a pen. Easy questions to skip. In multiple-choice questions, questions with a lot of thinking can be conceived and the answers can be seen directly, and if they are right, they can be marked if they are wrong, and then they will come back after the homework is completed.

In the big questions, the formulas of the mathematics and physics columns are not calculated, the answers are copied by chemistry and biology, and the questions with a lot of thinking are the same as the multiple-choice questions. Look directly. Skip the simple questions, look at the ideas for the questions with a lot of thinking, and then take a blank piece of paper and put it next to it, and briefly summarize the routines you haven't seen.

Premise: I plan to use my winter vacation homework to improve myself, and I have a certain foundation) 3 do not do.

Tell the teacher that you have a different study plan (prerequisite: good grades).

Colluded with the representatives of each class to get through the test.

4. Tear off part example: A set of rolls is required to have a total of nine sheets, only make five sheets, and tear off four sheets.

5. After saying that he is sick and handing in his homework on the same day, he will continue to make excuses and excuse himself, and if the teacher is really inconvenient, he will be sick for a week, a big law: the teacher generally will not check the homework, and the serious teacher will check the homework at most and will not check the homework seriously.

There was a dalao, how to send it down, how to hand it in, completely blank, no reaction, stone sinking into the sea)

Note: - The premise of the act of working with peace of mind is that you can guarantee that you can achieve the same effect without doing winter vacation homework.

Those who do not engage in any other learning activities do so at their own risk.

The cotton absorbs water, the weight increases a lot, and it is too heavy for the donkey to bear, so it can't stand up.

This story shows that specific problems need to be analyzed concretely, and the real causes of things must be understood, not metaphysics. Salt dissolves in water and reduces weight, while cotton does not dissolve in water, but absorbs water and uses the original thinking to do it, and the result can be imagined.

Because the weight of the cotton increases after being soaked in water, the donkey cannot stand up.

The lesson of this incident is that we should not commit empiricism, and we should adopt appropriate methods according to the actual situation.

The second question is to eliminate c in the system of equations, and solve the system of equations to obtain 11b-5a=-10

The deformation yields b = (10 11) + (5a 11).

When a>b, a-b = a-(10 11)+(5a 11)>0, the solution is: a>5 8, b>-11 8

When a=b, a-b=a-(10 11)+(5a 11)=0, the solution is: a=b=-5 3

When the relationship between aa and b is: 11b-5a=-10

Question 3: Let the equation of the straight line ab be y=kx+m, substitute the coordinates of the two points of ab, and find the equation of the straight line ab as y=[3 (a-b)]x-3b (a-b), so that the equation of the straight line ab is equal to 0, and the solution is x=b, that is, the coordinate of the intersection point d of the line ab and the x-axis is (b,0).

Because the OAB area is equal to the ODB area minus the OAD area, S OAB=OD 6 1 2 S ODB=OD 3 1 2

s△oab=od×6×1/2-od×3×1/2=od×3×1/2=b×3×1/2=3b/2

Substituting b = (10 11) + (5a 11) into the inequality from question 6 yields:

4<（10/11）+（5a/11）<20/3

Solve the inequality to get: 34 5

I know what to do, but I don't know what to do.

Set the electricity consumption in April x kWh.

x = 280 The area of pasture converted to forest farm is x hectares.

54-x=(108+x)×20%

x=27 has finally been found.