A math in the first year of junior high school, who will, a math in the first year of junior high sc

Because the average per cubic meter is "yuan", the gas consumption in April must have exceeded 60 square meters.

x=75 so the gas bill is $66!

Set the user's gas overconsumption in April x cubic meters.

Then: 60 * x 15 (cubic meters).

Then: in April, the user should pay the gas bill of 60*yuan).

According to the title, the gas used by the user must be more than 60 cubic meters (otherwise the gas fee should be yuan cubic meters). So you can set the user to use x cubic meters this month:

x=75, so the gas fee should be paid = 75*yuan.

Set up x cubic meters.

60 x 75

60*RMB) is absolutely correct

1. First of all, we must calculate how many edges this polyhedron has (24 vertices are known, each vertex has 3 edges, and every two vertices share one edge) 24 3 2=36

2. According to Euler's formula (v=vertex, f=surface, e=edge) v+f-e=23, 24+(x+y)-36=2 can be obtained

The solution is x+y=14

Euler's formula: for a polyhedron, the number of faces + the number of vertices - the number of edges = 2

24 vertices, each with 3 edges, then there are a total of 24*3 2=36 edges. Since each edge has two vertices, divide by 2

According to Euler's formula: x+y+24-36=2;

x+y=14

1。Solution: From the meaning of the question: -44-43-42-......54+55

2。Solution: According to the question, set a=21k, b=15k, c=10k

a-b）÷（b+c）=7k÷25k

73/25: Inspired by the "split term method" in the summation of fractions, I found the following 10 different even numbers (within 100):

Inspection: 1 2 1 6 1 12 1 20 1 30 1 42 1 56 1 72 1 90 1 10

1 4:|ab+2|=0 |a+1|=0

So a=-1 b=2

Substituting the formula gets:

1。Solution: From the meaning of the question: -44-43-42-......54+55=45+46+……54+55

2。Solution: According to the question, set a=21k b=15k c=10k (a-b) (b+c)=7k 25k

73/25. No.

4。No.

Solution: If you set up a rotten ambush, you should buy x million yuan.

1+Solution x=

Answer: The department should buy 10,000 yuan of this kind of treasury bill.

3 to the power of 555 = (3 * 5) to the power of (555 5) = 15 to the power of 111 to the power of 4 to the power of 4 = (4 * 4) to the power of (444 4) = 16 to the power of 111 to the power of 5 to the power of 5 = (5 * 3) to the power of (333 3) = 15 to the power of 111 4 to the power of 4 to the power of 4 to the power of 555 to the power of 5 to the power of 5 to the power of 5 to the power of 5.

3 of less than 4 of 5.

For numbers greater than one, the larger the number, the greater the power.

3 to the 5th power to the 111th power, 4 to the 4th power to the 111th power, 5 to the 5th power to the 111th power, and then compare the size of 3 to the 5th power, 4 to the 4th power, and 5 to the 5th power.

Question 1. Original = 10

Question 2. The original formula is equal to (2-1), (2+1), (2 2+1), (2 4+1), ......2^64+1)+1

Decompose the factor. Question 1.

Original = x -x-2-2x +8x-8

x²+7x-10

x-2）（x-5）

Question 2. Original = (a+b) -4(a+b)+4(a+b-2).

Rely on my answer is the same as upstairs, I thought about it, but upstairs said, It seems that I am still a beat slower, (x+1)(x-2)-2(2-x) 2, this can actually be directly raised (x-2), because (2-x) 2 and (x-2) 2

It's the same.

Multiply (2-1) in front and combine the following equation to get :

Decomposition factor: 1(x+1)(x-2)-2(2-x)^2=x^2-x-2-2(x^2-4x+4)=-x^2-7x+10)=-x-2)(x-5)

2.(a+b)^2-4(a+b-1) =a+b）²-4（a+b）+4（a+b-2）²

I hope it helps you again.

Set to buy 20 yuan, the total gold yuan is late: x 20 = 36 set to buy 20 yuan, the total gold: x 20 = 42 because ** between the yuan and the yuan orange sedan chair, so, one is the least total gold when the one is thick, and the other is the most.

36 = Total Gold = <42

∵ad=cd

Again 1= 2

1=∠2，ab∥cd

Ab ≠ cd, and AD=BC

Quadrangular ABCD isosceles trapezoidal.

ab=ac，∠acb=∠abc=2∠bac

Whereas ACB+ ABC+ BAC=180 degrees.

BAC=36 degrees, ACB= ABC=72 degrees.

Take the point e on AC so that be=bc

then δabc bce, ae=be, ec=a-bec bc=ac bc

i.e. (a-b) b=b a

a^2-ab-b^2=0

a=(b+√5b)/2

a/b=(1+√5)/2

a:b=(1+√5)/2

From the given conditions, it can be seen that these two triangles are an isosceles triangle with a top angle of 36 degrees and an isosceles triangle with a base angle of 36 degrees, and the minimum angle of the coincidence gives a set of similarities, from which the ratio (a-b) b=b a collation gives (a b) squared-a b-1=0 to solve this unary quadratic equation about a b, and we get x1=(1+root number 5) 2 x2=(1-root number 5) 2 (not in accordance with the topic, discarded) so.

a b = (1 + root number 5) 2

Since any two sides of the triangle are greater than the third side, the first one is an acute triangle, the second is an obtuse triangle, let the minimum angle be , and the first triangle is used as an auxiliary line to get tan = b a, and the second triangle is given cos = a 2b, then sin = 1 2 is equal to thirty degrees, so a:b = 3:1

Have you learned the use of angles and edges now? It's sin or cos or something like that.

OK! Because the position of the two trees is fixed.

Standing in the place where the beads were placed, I saw that tree A was 40 degrees west-north, and that tree B was 60 degrees east-south;

So draw a sketch according to the up, north, down, south, left, west, right, and east, and assume:

1) Standing in the A-tree position, the beads should be 50 degrees south-east; (2) Suppose standing in the position of tree b, the beads are in the direction of 60 degrees west-north.

Take two trees as the reference point, and the intersection point of the two direction lines is where the beads are located! Yes, just find the intersection of two straight lines.

Yes, just find the intersection of two straight lines.