Math Difficulty! Please advise! Big math problem!!

Note: The "*" represents the multiplier sign.

Solution: 8*6=48 (square meters) Ceiling area.

6*3*2=36 (square meters) Wall area on both sides.

3*8*2=48 (square meters) The wall area of the two fronts.

48 + 36 + 48 = 132 (square meters) Classrooms (including doors and windows) should be painted.

square meters) ·· The classroom really has to paint the area (go to the doors and windows).

Yuan) square meters * money per square meter = amount of money spent.

A: It costs $ to paint this classroom.

Surface area: 2*(8*6+8*3+6*3)=180 square meters.

Deduction of doors and windows: square meters.

Ground deducted: square meters.

Cost: RMB.

Only use the 4 walls and the roof to paint them, find their total area, subtract the area deducted from the doors and windows, the area to be painted, and finally multiply by the paint cost per square meter. 8*6+6*3*2+8*3*2=132 (total area) The area that needs to be painted).

The bottom area is 8*6=48

The area of the two sides is 8*3*2=48

The area of the other two sides is 6*3*2=36

48+48+RMB.

After walking the full length of 3 8 after the distance from the midpoint: 60-20 = 40 meters.

So 40 meters is 1 2-3 8 = 1 8 for the full length

So the distance between the east and west villages: 40 (1 8) = 320 meters.

Solution: The distance between the east and west villages is :

320 meters.

Let a 2+ab+1=k(b 2+ab+1), there is a 2+ab+1 kb 2 kab k a 2 kb 2+(1 k)ab+(1 k) 0

get a 2 kb 2 (k-1) (ab+1) get (a- kb) (a+

kb)=(k-1)(ab+1), because ab is an integer, so the right side of the equation is an integer, so k must be a perfect square number, let k=m 2, then it becomes (a-mb)(a+mb)=(m-1)(m+1)(ab+1).

m-1=0!a-mb=0,a=b!

Easy to understand:

The above are all multiples of 4, take the above prime numbers, from small to large according to the vertical arrangement into a square, the prime numbers are: 8, 12, 20, 28, 44, 52, 68, 76, 92

Arrangement: 8, 28, 68

8 times 28 is 224

28 times 68 product is 1904

68 times 12 is 816

12 times 44 makes 528

44 times 76 is 3344

76 times 20 product is 1520

20 times 52 is 1040

52 times 92 makes 4787

So choose d to wish you progress in your studies, and I hope you enjoy math!

224 1904 816 528 3344 1520 1040 14x16, 34x56, 24x34, 22x24, 44x76, 38x40, 26x40, a20x49 Option A doesn't seem to have anything to do with these numbers. b 4x711 This is the most special, so I don't choose it. c203*28 This is also outrageous, d23*13*2*2*2*2 is obviously the same as the previous numbers, only 2 digits multiplied by 2 digits.

The other terms all find the same factor as the previous terms, d has exactly 26 and a is clearly not true, and from the law of large and small numbers, 4784 is more consistent.

You die, I want you to die, don't want it, life and life, I want to love you, I want you to die you. Is that right?

Feed!!? The one with the most words in the answer!!

52 times 92 is obviously 4784, isn't it serious?

13-13x16 17 = 208/17.

The region d is symmetrical with respect to the straight line y=0, so ydxdy=0, so the original = |x|dxdy

4∫<0,1>dy∫<0,1-y>xdx

2∫<0,1>(1-y)^2dy

2/3)(y-1)^3|<0,1>

I choose C.

Select option C, and the solution process is as follows:

After reading it, I won't talk about how to calculate it, but it's relatively simple in terms of method.

A p is a point on a circle, substituting p into the formula of the circle to rescue the value a, and obtaining the coordinates of the p point, you can find the length and slope of pq.

2. First determine whether the point o is in the circle or outside the circle or on the circle, on the circle: max is the diameter min is 0

Within the circle: max radius plus the distance from the center of the circle to the point q min radius minus the distance from the center of the circle to the point q.

Outside the circle: max radius plus the distance from the center of the circle to the point q min radius minus the distance from the center of the circle to the point q.

The third is to say the point on the circle of m(m,n), so m or n is expressed by n or m, and then substituted into the formula of k below, and the method of finding the function is used to evaluate the value, that is, to find the derivative.

Generally 1 2 represents one half, 1 4 represents a quarter solution: 5x 2-3xy+1 2y 2-2x+1 2y+1 4=020x 2-12xy+2y 2-8x+2y+1=0(4x-y) 2+(2x-y) 2-2(4x-y)+1=0(4x-y-1) 2+(2x-y) 2=0 4x-y-1 0

2x-y＝0

Solution: x=1 2, y=1