Math problems, math problems

1. The area of 20* meters forward is square meters.

2. 2*4* trees were planted.

3. The remaining area (square meters.)

4. The area of the wooden cover [(square meters, iron sheet length.

5. The length is the diameter of (

First of all, declare; I calculated the use of; The value in the example is =

01.Answer: The area of the road pressed by the forward meter is square meters.

02.Answer: A total of 16 trees were planted.

03.Answer: square meters.

04.Answer: square meters. Iron sheet length cm.

05.Answer: Through-line length in cm; Small rods in diameter cm.

First of all, declare; I calculated the use of; The value in the example is =

01.Answer: The area of the road pressed by the forward meter is.

02.Answer: A total of 16 trees were planted.

03.Answer: square meters.

04.Answer: square meters. Iron sheet length cm.

05.Answer: Through-line length in cm; Small stick diameter cm Good luck with some progress.

Sweat to death! Sixth-grader. Hehe.

If the traffic flow of the North Ring Road is x, then the traffic flow of the Esplanade is x+3600, according to the title:

3x-(x+3600)=8500*2

x=10300

x+3600=13900

The traffic volume of the North Ring Road is 10,300 vehicles per hour, and the traffic volume of the Corniche is 13,900 vehicles per hour.

9. =-2(a+b) squared =-2a squared-2b squared-4ab

Substituting yields -2 (1 6) squared = -1 18

Think of (a+b) 2 as a whole.

Combined with the same type =-2(a+b) 2 =-2(1 6) 2=-18/18

Question 9? Simplified to -2(a+b) 2 and then put a and b in, the result is -1/18

The square diagonal is the diameter of this circle, and the square diagonal = 2 +2 =8

Radius of the circle r = half the length of the diagonal = root number 2

Circle area = r = 2

The maximum square side length in the circle is 2dm, which shows that the four vertices of the square are all on the circle, and the lines of the non-adjacent vertices are past the center of the circle.

The diameter of the circle d = square diagonal = under the root number (2 2 + 2 2) = 2 root number 2 radius r = 1 2 diameter = root number 2

Circle area = root number 2) 2 = square decimeter.

Don't know how to ask me.

So n = 7 for B

2.(n-2)*180=sum of internal angles.

The closest is 180*17-360=2700

So 2700-2570=130

The second half of the question is not very clear.

A large triangle made up of 2 small triangles does not count.

4.(n-2)*180 n>135 nmin=9 substituting into the formula book is 11

6.The substitution shortener formula is n=10

7.Substitut the formula n=15

a 20b 8

C 19b earns $10.

b 15,37

A 16-column equation solution problem:

Solution: To make the box body with x sheets, then make the bottom of the box (150-x) slag hail rock sheet.

2*16x=43(150-x)

x=86,（150-x）=64

Set the annual interest rate to be x

2000+2000x(1-20%)=2160x=10%

1) The diagonal formula for n-sided is n(n-3) 2 with surplus into the match, so choose bn-3 n-2

8) Zhixiang N-3B

Forgive me for graduating for a long time, I can't calculate, write about the method, I hope it will help you:

After substituting the equation of the straight line into y=kx+b, substituting the equation of the circle, a non-quadratic equation is obtained to solve the abscissa of two x is the intersection of the two points, and then substituting each abscissa into the linear equation to solve the corresponding ordinate, which is the coordinates of the two intersection points;

With the coordinates of two points, use the square of the y value of the two coordinates subtracted + the square of the x value of the two coordinates subtracted, and the root number is opened. It's the distance you ask.

The total number of people in the two teams remains the same:

50 [5 (3+5)-5 (7+5)]=240 people.

The original number of team A: 240 5 (3+5)=150 people;

The original number of team B: 240-150 = 90 people.