The diameter of a circular flower bed is 10 m. There is a fence around it. How long is the fence? What is the floor area of the flower garden?

The diameter of a circular flower bed is 10 m. There is a fence around it. How long is the fence? What is the floor area of the flower garden?

3.14 × 10 = 31.4 (m); 3.14 × (10 △ 2) 2 = 3.14 × 25 = 78.5 (M2); a: the fence is 31.4 m long; the flower bed covers an area of 78.55 m2

Square Garden, one side against the wall, the garden surrounded by a fence, the fence is 12 meters long, how many square meters of this garden stand?
If 5 / 8 of the land is occupied by cabbage, how many square meters is the cabbage station?

12/3=4
4 * 4 = 16 square meters
16 * 5 / 8 = 10 square meters

As shown in the picture, a 24 meter long fence is used to form a rectangular flower garden with two fences in the middle on an open space near the wall. The width AB is x meters and the area is s square meters
(1) Find the function relation between S and X and the value range of independent variable
(2) If the minimum utilization length of the wall is 4 meters and the maximum utilization length is 8 meters from the design point of view, the maximum area and minimum area of the enclosed garden can be calculated

1、S=24x-4x²= -4（x-3）²+36,0

What is the - 2 / 3 power of (0.001)

Hello
(0.001)
=2 / 3 of (0.1 to the third power)
=To the - 2 power of 0.1
=100
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If s = 1 + 11 + 111 + 1111 + 11111 + +11.11 (a total of 30 ones) what is the ten digit number of S?
This is a true simulation test paper in the additional questions, I did many times or wrong. So Baidu asked you to help, tomorrow to hand in the paper. So very nervous
Remarks: 1. The answers should be presented in the form of arithmetic;
② The process should be concise and clear;
3. First come first served, if not accepted, thank you for your answer. If you can't skip this question, don't make complaints about it!

Its ten digit number is the same as 1 + 11 + 11 +. 11 (29 11 in total)
1 + 11 + 11 +. 11 (29 11 in total)
=1+11*29
=1+319
=320
That is, the ten digit number is 2

The maximum and minimum of x square - 4x in "0,3"

f(x)=x²-4x=(x-2)²-4
Vertex at (2, - 4)
Open up
The minimum is f (2) = - 4 at x = 2
f(0)=0
f(3)=1
The maximum value is f (0) = 0 at x = 0

The coil resistance of a motor is 2 Ω. When it is connected to a 220 V power supply, the current in normal operation is 4 a. the heat generated by the current in 1 min of normal operation is 4 a______ J. The motor works normally within 1 min______ The electric energy of J is converted into mechanical energy

(1) Heat generated by motor coil: q = i2rt = (4a) 2 × 2 Ω × 60s = 1920j; (2) work done by current: w = uit = 220V × 4A × 60s = 52800j; mechanical energy output by motor: W machine = w-q = 52800j-1920j = 50880j

Given 6 ≤ m ≤ 12, M / 2 ≤ n ≤ 3M, the value range of M + n is obtained

m

If the rated frequency of microwave oven is 2450MHz, what is the wavelength? The nameplate is marked with the words of 220V 800W, and its rated current is? What is the power consumption for 2min?

I = P / u = 800W / 220V ≈ 3.64A w = Pt = 2x60sx800w = 96000j, wavelength 12.2cm

Simplify evaluation [(x ^ 2-16 / x ^ 2 + 8x + 16) + (x / x-4)] / (1 / x ^ 2-16), where x = root 2 + 1

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