The second year of junior high school math problems does not seek answers and processes!!

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Dear, this topic is very simple,.

The inverse proportional function passes through the point a(-2,m) and substitutes the function y=-6 x to get m=3, which can be n=3 in point b

So n=m=3

Second question. Once the function passes the point a(-2,3)b(3,-2) and substitutes the function y=kx+b to obtain the following equation:

2k+b-3=0

3k+b+2=0

The solution yields b=1 and k=-1

So the analytic expression of the primary function is: y=-x+1

The third question: the length of ab is: root number (-2-3) 2 + (3 + 2) 2 = 5 root number 2

The distance d from the origin o to the straight line ab is the height of the triangle aob.

So d = root number 2 2

s(aob) = 1 2 times 5 root number 2 times root number 2 2 = 5 2 so the area of the triangle AOB = 5 2

The images of the primary function y=kx+b and the inverse proportional function y=m x intersect at a(2,3),b(-3,n).

3=m2 gets m=6

n=6/(-3)=-2

The images of the primary function y=kx+b and the inverse proportional function y=m x intersect at a(2,3),b(-3,n).

3=2k+b,-2=-3k+b

k=1,b=1

1.Find the relationship between the primary function and the inverse proportional function;

The primary function 2=5y=x+1 and the inverse proportional function y=6 x2According to the given conditions, write the solution set of the inequality kx+b m x directly: 32

3.The point B is the BC X-axis, the perpendicular point is the point C, and the S ABC is found.

s△abc=bc*h/2=2*5/2=5

1) Both points are on the inverse proportional function, directly brought in, and the solution of m 3,n 3(2)a(-2,3)b(3,-2) equation is very well solved, x y 1

3) The intersection point of the line with the x-axis m(1,0).

s＝½om×（3＋2）＝5／2

(x+1)(x+2)(x+3)(x+4)=120 Combine the first term with the fourth term, and combine the second term with the third term to obtain (x 2+5x+4)(x 2+5x+6) = 120 req x 2+5x=a, and obtain (a+4)(a+6)=120 to solve this equation, and obtain a=6 or a=-16

When a=6, there is x 2 + 5 x - 6 = 0 and (x + 6) (x - 1) = 0 to get x = -6 or x = 1

When a=-16, there is x 2+5x+16=0, and according to the discriminant formula, the equation has no solution, x=-6 or x=1

(x+1)(x+4)(x+2)(x+3)=120(x 2+5x+4)(x 2+5x+6)=120, let x 2+5x+4=t

t(t+2)=120

t^2+2t-120=0

t-10)(t+12)=0

t = 10 or -12

x^2+5x+4=10

x = 1 or -6

x^2+5x+4=-12

x has no solution, so x=1 or -6

Replace that step can also be replaced with x 2 + 5 x + 6 = s and so on.

Multiply the first bracket with the fourth, and multiply the remaining two.

x 2 + 5x + 6) (x 2 + 5x + 4) = 120 set t = x 2 + 5x + 5 (t -5 4).

t+1）（t-1）=120

t = 11 or -11 (rounded).

i.e. x 2 + 5 x + 5 = 11

x = -6 or 1

(x+1)(x+2)(x+3)(x+4)=120 (x+1)(x+4) x+2)(x+3) =120(x 2+5x+4)(x 2+5x+6)=120, let y=x 2+5x+5

The original equation is deformed as (y-1)(y+1)=, or y=-11 substitutes y=11 into y=x 2+5x+5

x＾2+5x+5=11

x = 1 or -6

y=-11 substitution, no solution.

As a math teacher, I didn't even know how to do this problem at first. Khan searched for it, and the answer came out.

(x+1)(x+4)=x2+5x+4

x+2)(x+3)=x2+5x+6

Therefore, this problem can be broken down by the commutation method.

Solution=(x2+5x+4)(x2+5x+6)-120 so y=x2+5x+5, then the original = (y-1)(y+1)-120=y2-121

y+11)(y-11)

x2+5x+16)(x2+5x-6)

x+6)(x-1)(x2+5x+16).

Multiply the first and last two terms, multiply the middle two terms, and let a=x*x+4x+4, then the equation becomes a(a+1)=120, and the solution a is sufficient.

Is it so simple to ask? Isn't it just a covenant? The numerator and the denominator are the same as the denominator, and the division is reversed and multiplied, which is not the same as the multiplication and division of fractions learned in elementary school, but now it is replaced by letters, and the method is the same.

You go out and see, how many even have to ask about elementary school math, you can wait in line for tomorrow.

Make b about the symmetry point b of the straight line l'

ab'*ab'=8*8+（

ab'=17

The minimum value is 17

As a symmetry point A1 with respect to l, then the minimum value is Ba1 ( 17 in the square

(1).

28 is the mystery number: 8*8 - 6*6 = 282012 is the mystery number: 504*504 - 502*502 = 2012(2).

Proof : 2k+2) The value of 2 - 4k 2 is a multiple of 4 = 4k 2 + 8k + 4 - 4k 2 = 4 + 8k

4(1+2k)

4 (1+2k) is a multiple of 4.

The definition of the mysterious number is as stated in the title:

If a positive integer can be expressed as the difference of the squares of two consecutive even numbers, then the positive integer is mystical (2x) 2 - 2y) 2 (x > y) mystical numbers are even, and the square difference of two consecutive odd numbers (taken as a positive number).

k-1) 2 - k2 = 2k + 1 is an odd number.

The square difference of consecutive odd numbers (taken as a positive number) is not a mystery number.

Both are 2. Each item is a quarter of a maximum, except for one.

1.Solution: Let the number of B be x, then A is 2x-20, so there is 4000 x=7600 (2x-20), and x=200 is obtained, so A is 2x-20=380

2.If bottled water is sent, the cost is: 4000 liters * 1 liter = 4000 yuan;

For example, the cost of water delivery from the water tower: 500 * 4000 500 = 4000 yuan.

1. Scenic spots are calculated by dividing the total ticket price by the number of scenic spots.

2. Tourists are calculated by dividing the total income of scenic spots by the number of scenic spots.

3. The algorithm of tourists is close to reality. The scenic spot is playing the trick of keeping the average ticket number unchanged. Income is a reflection of the nature of the problem. Isn't the scenic spot just to make money?

1. The sum of the original prices of the five attractions is equal to the sum of the current prices.