Math problems, help!! Math problems, help!!

1.Let the radius be r

2pi*r=

r=3 area:

s=pi*r^2=

Area s=pi*r2=

3.(1)s=

3)d=,r=

s=pi*r^2=

Find the radius for the perimeter and then calculate the area.

Area formula. Square metre.

The usable area in the yurt.

The area formula for a circle.

The area of the circle The usable area of the yurt.

Question 1: The outer diameter of the yurt is r

2*gives r=3

Question 2: The inner diameter of the yurt r=

Then the area inside the yurt is = m

Question 3: (1) Table area s1 = m

2)s1/s=?

3)s2=s2/s=?

1. Circumference of the circle area 4:

The size of the yurt:

2. Circle area * radius 2

The usable area in the yurt.

1) The area of the rectangle is long * wide.

The area of the table:

2) The area of the table The usable area in the yurt.

3) Circle area * diameter 2 4

The usable area in the yurt.

The area of the furnace The usable area of the yurt.

The result is 2 3

First of all, each item extracts a 1 3, and the rest is 1+1 2+1 4+...= 2, so the result is 2 3

Only one question is known. Solution: Assume that the income of rural residents in China in 2005 is X yuan. （1+10%))=3578 x≈3255

1） -5°c+8°c=+3°c

2) Bi Shi Yu Add up these changes to 160 + 30-20 + 17 + 18-20 = 185 (units).

Then the weekly core high five is 185

1) Expressed by the formula: the temperature reached after the temperature rises from -5 °C to 8 °C: (-5) + 8 = 3 °C

2) The blood pressure should be measured once a day in the afternoon, and the following table is the patient's blood fibrillary pressure from Monday to Friday

Monday, Tuesday, Wednesday, Thursday, Friday.

Blood pressure 190 units, thick vertical mess 170 units, 187 units, 195 single rock stalls, 175 units.

Because b q is parallel to ba, and b q = ba

So b c = 1 2bc

So bb = 1 2bc = 3

Set BB'for x, b'c is 6-x, and ab is y 2

sqb'c=y(6-x)/4

sabc=3y, which is obtained by the known area relationship x=3

The second question does not need to be explained, basic nature.

1c 2c

1.Calculate the square of the ABC and compare the sizes.

When a b = n (n is a constant), (a+1) b=n+1, a (b+1)=n-2Launch.

a+1) b=a b+1,a (b+1)=a b-2}, so.

For your reference.

Since a*b=n (n is constant), we get (a+1)*b=n+1, a*(b+1)=n-2

So 1*1=2

According to the meaning of the title: a=1, b=1, n=2

So 2 1 = 3, 3 1 = 4 ......2008 1 = 2009 so 1 2 = 0, 1 3 = -2 ,......1 2008 = -4014 so 2008 2008 = 2009-4012 = -2005

The first question is c, and the second question is equal to 2

I don't feel sure to pull the third question, it's been too long to come out, and I'm back to the teacher, so it should be A.