Math, 100 bounty, yes.

Guo Dun: The function f(x) = tanx

Solve the equation f(3 4 x) = 1, then.

tan（3π/4－x）=1

tan（π/4）=1

4=3π/4－x

x=π/2。

x ( 2, 2) ( 2, 3 2), the image of the line y=a and f(x) intersects m,n, proving that for any a r, |mn|is a fixed value.

x ( 2,3 2), the function tan x is the periodic function, the period is and the interval ( 2,3 2) is exactly the two periods of 2 , the value of the image y of the period ( 2, 2) and ( 2,3 2) tan x is the same, the distance between the corresponding points in the two images is equal (similar to the equidistant distance between parallel lines), |mn|= 2 ( 2)=3 2 2= while tan( 2 is the image in the fourth quadrant), tan x( 2 is the image in the first quadrant); tan( 2) image in the second quadrant), tan x( 2) image in the third quadrant), the line y=a, a r, and the image of f(x) intersect m,n, |mn|is a fixed value.

1) tan(3/4 pi -x) = 13/4 pi -x = 1/4 pi + k pix = 1/2 pi + kpi

2) f(x) is a periodic function, the period is pi, so mn is a fixed value is pi

Calculate the purchase price balance first.

According to a kind of vertical rented goods, if it is sold for 95 yuan, it will lose 5%, and it is obtained.

The purchase price is 95 (1-5%) = 100 yuan.

To make a profit of 15%.

100x(1+15%)=115 yuan.

The sales price should be set at $115.

115 yuan. Set the original price of the product to be $x.

Nasmir 1-5%) x = 95

x = 100 profit 15%, Tan Min let shirt earn 100 * 15% = 15 yuan.

**100 + 15 = 115 yuan.

1. All the second question is very simple, 9 points less and 9 more points have the same effect on the average score, so the new average score is 56-(points.

The first question is that the strength of 6 students is 54, and the impact on the whole is divided into points, and the total number of people in each person is 54.

There are x number of students.

56x+9*6=

x=36 with 36.

There are x number of students.

56*36-9*6) 36= points.

There are x students in class A, and according to the topic, you can get: 56*x+6*9=

Solution: x=36 people.

The average of Class A will become: (56*36-6*9) 36=points.

Answer: If there is x people in class A, then there is 56x+6*9=, and x=36;

Then there are 36 people in Class A;

If each of the six students scores 9 points less, then there will be (56*36-9*6) 36=The average of Class A will become;

9 6 people

56-6 9 36 points 36 in Class A; Class A's average score will become a score.

There are x people.

56x+6*9）/x=

x = 36 total points for all = 56 * 36 = 2016

6 students get 9 points less, then the total score of all people is 2016-6*9=1962, average score=1962, 36=

6*9=54

There are 36 people in Class A.

Class A's average score becomes.

If there are x people, then (56x+6*9)=

Then x=36 and the six students each scored 9 points less, then the average = 56-(

I've done the math for you several times, and the first question is a bit of a problem, and the answer is as follows.

(1) 387,797,800 400 million 12 degrees +11 degrees 350,000 50 degrees 66 degrees.

Because the angle AOC plus the angle AOB is equal to 180, the angle AOM plus the angle AOB is equal to 90, and because the angle AOM minus the angle AOM is equal to the angle MON is equal to 40, the angle AOM is equal to 65, and the angle AOM is equal to 25. So the angle AOB is equal to 50 and the angle AOC is equal to 130.

The sum of the angle AOC and the angle AOB is 180 degrees, so the angle con is 90 degrees, and the rest is not to be talked about.