A simple math problem in the second year of junior high school, kneeling for the answer!!!!!!!!!

The total area is 3 * square centimeters, so the square of the side length of 225 = 15 centimeters.

Let the side length of the square be x

x^2=x=15

area is equal).

Because the ratio of length to width is 3::5, 30 stamps must be arranged in a 5:6 pattern to form a square. Specifically, there are 5 rows (longitudinal columns) and 6 rows (horizontal rows), so that there are 3 5 = 15 cm horizontally and vertically.

So form a square with a side length of 15 cm.

Put 5 pieces horizontally and 6 pieces vertically, so that it is a square, and the side length = 30 * 5 * 4 = 600cm.

(1) As shown in the figure, ac, be intersect at the point m, be, ad intersect at the point n, so ame= e+ c anb= b+ d (outer angle definition), because ame+ anb+ a=180°(sum of the inner angles of the triangle), so a+ b+ c +d+ e=180° that... Maybe the letter mark is not the same Matchmaking Look at it o( o

One, can, 180

Second, can 180

Three, can, 180

Four, can, 180

Equilateral triangle with outer bisector CE, ace=60=ade

ADCE four-point contour, AED=ACD=60, and the circumferential angle of the same arc is equal.

I changed: (1) 60-x-y

2) From the title, 900x+1200y+1100(60-x-y)= 61000, and y=2x-50

3) From the title, p= 1200x+1600y+1300(60-x-y)- 61000-1500, finishing, get p=500x+500

The number of mobile phones purchased in Type C is 60-x-y = 110-3x According to the inequality group of the title, 110-3x is greater than or equal to 8

2x-50(y) is greater than or equal to 8

Solve 29 x 34

x ranges from 29 x 34 and x is an integer

p is a primary function of x, k = 500 0, p increases with the increase of x When x takes the maximum value of 34, p has a maximum value, and the maximum value is 17500 yuan At this time, 34 type A mobile phones, 18 type B mobile phones, and 8 C type mobile phones were purchased.

1. Solution: Let c have Z part, then: 900X+1200Y+1100Z=61000

z=(610-9x-12y)/11 (x、y、z ≥8) （1）

2. Solution: A total of 60 parts, so x+y+z=60 (2).

It is obtained from (1) and (2) together.

2x+y=50 (x，y≥8)

3. Solution: p=1200x+1600y+1100z-61000-1500 (3).

Synoptic from (1), (2), and (3).

p=...I won't bring it, you can just bring it in and tidy it up yourself)

(There is the relationship between p and x, and then find the highest point of the parabola to find the value of x, and then find the value of y and z, for you in the second year of junior high school, you should be able to calculate (*.)

I'm also in the second year of junior high school, but why are your questions so difficult?! I wish you a satisfactory answer.

Do AD perpendicular line over m, and the vertical foot is n

c = 90 degrees, dm bisected ADC

The triangle DCM is congruent with DNM, mn=mc

Because m is the midpoint of BC.

So mn=mc=mb

b=c=90°, with a common side am

So the right triangle abm is congruent with anm.

i.e. am split dab

"Bieber Only" Hello, glad to answer for you!

Solution: A+B>=2 under the root number AB, and A 2+B 2>=2AB, A=9, B=10, under the root number AB<=(A+B) 2=19 2.

Hope mine is helpful to you

Because the volume of the two bottles is the same, set to v, then the first bottle has a total of (p+1) parts of the solution, so the volume of the unfilled solution is v (p+1), and in the same way, the second bottle has a total of (q+1) parts of the solution, so the volume of the unfilled solution is v (q+1), so when the two bottles of solution are mixed, the volume of alcohol is p*v (p+1)+q*v(q+1), and the volume of water is 1*v (p+1)+1*v(q+1), so the ratio of the two is (2pq+p+q) (2+). p+q)

(1) Total gross profit in March Gross profit per piece = 30,000 x pieces.

2) The cost ** remains unchanged, the sales price is reduced by 4 yuan, only the gross profit is reduced, therefore, the gross profit of each item in April is:

X-4(3) April sales increased by 500 units compared to March, namely:

30000/x+500

4) Gross profit of each product in April * Sales volume in April = (x-4) * (30,000 x + 500).

Listen, first simplify the cubic of x + xa + 3x-2b = the cubic of x + 5x + 4, and then you put the equations on both sides together, the cubic of x = the cubic of x, xa + 3x = 5x (get a = 2), -2b = 4 (get b = -2), ok.

Extend the CD to the intersection point E of the line segment BM (point E is added by itself).

The two lines are parallel and the inner misalignment angles are equal.

Therefore, that angle of 65° is equal to = deb = 65° known c is 90° (because it is rectangular).

Therefore, a=25°