Who is good at math ? Who is the best at math?

1. Solution: Let the number of edges be x, 2x

Then [180° (x-2)] [180° (2x-2)]=3 8 gives x=5Answer: The number of sides of these two polygons is 5 and 10

2. Solution: If the inside of the regular pentagram is connected into a regular pentagon, then each inner angle of the regular pentagonal is .

180° (5-2)] 5=108°, so the co-angle of each inner angle is 72°, so the pentagram.

1 2 = 3, 4 5 = 6, and 3 6 7 = 180°, so the sum of the inner angles of the pentagram is 180°.

3. Solution: Because the sum of the internal angles of the polygon = 180° (n-2) (n is an n-sided shape), if n increases by 1, then the sum of the internal angles of the polygon is 180° (n+1-2) = 180° (n-1), so the sum of the internal angles increases by 180°. If it is doubled, then the sum of the internal angles is 180° (2n-2) = 180° 2 (n-1), so the sum of the internal angles is doubled by +180°.

1.Let the first polygon be n 3 (2n-2) = 8 (n-2) with a 5-sided and a 10-sided.

2.The sum of the inner angles of the regular pentagram is 540°, which divides the regular pentagram into 5 triangles. The general pentagram has not changed.

3.Increase by 180°, increase by 180n°

The cell length of your excel is not too small, if the number cannot be displayed is to be rounded to 4.

It is recommended that you widen the length of the cell.

(1) Solution:

Set the height to x and the bottom to y

then the original area is (1 2)xy

The current high is (1+

The current bottom is (1+

Now the area = {(1+.)

2 = so the area increases (0..)

502 percent) solution: The original price of this car is X yuan.

x(1+x=60000.)

3) Solution: Let the numerator of the original fraction be x, and the denominator is y, then the original fraction is x of y

The current fraction is 3x=1 2y/y

The solution is x=2 and y=3

So the original score was 2/3

So the score increases (1-2/3) 2/3 = 50 percent

Answer: Original = ah 2

A becomes 6a 5

h becomes 5h 4

s present = 3 2s original.

So the area of this triangle should increase by 1 2

Solution x=60000

3.According to the question, the original score is 2 3I will increase the value from 2 to 3 to 1 point by 50%.

None of them are right.

The former, should be written.

log2 (2^n)=n

The latter one, I don't understand what your base number is?

If the base number is 10, it should be written "lg(2 6)".

If the base number is 2, it should be written as "log2(6)".

f(x) is the odd function that defines the domain r, so f(0)=0; and f(-x)=-f(x).

When x>0, f(x)=x 3+x+1;

When x<0, -x>0, so, substituting -x into the above equation, there is:

f(-x)=(-x) 3-x+1=-x 3-x+1 So, f(x)=-f(-x)=x 3+x-1;

To sum up: in three paragraphs:

When x>0, f(x)=x 3+x+1;

When x>0, f(x)=x 3+x+1;

When x=0, f(x)=0

Let x<0 then -x>0 f(-x)=-x cubic -x+1 Since f(x) is an odd function on r, so f(x)=x cubic +x-1 looks like this.