C language programming, calculation 1 + 1 / 2 + 1 / 3 + +The sum of 1 / 99 + 1 / 100 (Note: 1 / 2, 1 / 3 1 / 100, which is a fraction in Mathematics)

C language programming, calculation 1 + 1 / 2 + 1 / 3 + +The sum of 1 / 99 + 1 / 100 (Note: 1 / 2, 1 / 3 1 / 100, which is a fraction in Mathematics)

#include void main() { float result; int i=1; do{ result＋=1.0/i; i＋＋; }while(i

The eccentricity of the ellipse is determined by a section of a plane cylinder at an angle of 30 degrees to the bottom

e=1/2
The major axis of the ellipse, the diameter of the circle on the ground and the photographing from the top of the major axis to the bottom form a right triangle. Let the radius of the circle be r. the major axis a of the ellipse can be obtained from the relationship of 30 ° angle, and the length of the minor axis B is the diameter of the circle
Now that we have found a and B, we can find the eccentricity of the ellipse

Use 36 cm wire to make a rectangle that is 5 times the length and width. What's the area of the rectangle

If the width of a rectangle is x cm, the length is 5x cm
According to the meaning of the question, the equation can be listed: 2 (x + 5x) = 36
The solution is: x = 3, 5x = 15
So: Area s = 45 square centimeters
I don't know if you have learned the equation. If you haven't learned it, you can directly write the formula: width = 18 / (5 + 1) = 3, length = 15
Area = 3 * 15 = 45 square centimeter

2x+3y=5,4x^-9y^=20,4x^+9y^=?

2x-3y=4
(2x+3y)^2-(2x-3y)^2=24xy=9
4x^+9y^=(2x+3y)^2-12xy=25-4.5=20.5

Given two points a (0, - 3) B (4,0), if point P is a moving point on the circle x ^ 2 + y ^ 2-2y = 0, then the minimum value of △ ABP area is? And the circle can be obtained
Is it the radius of the earth

From the equation x ^ 2 + y ^ 2-2y = 0 of the given circle, it is obtained that x ^ 2 + (Y-1) ^ 2 = 1, the coordinate of the center g of the given circle is (0,1), and the radius r of the circle is 1. From a (0, - 3), B (4,0), it is obtained that the slope of AB = (0 + 3) / (4-0) = 3 / 4, and the equation of AB is y = (3 / 4) x-3, that is, 3x -

It is proved that P is the smallest prime number divisible by (p-1)! + 1
The point is the smallest
It's factorial

P is the smallest prime number divisible by (p-1)! + 1
Certificate:
According to Wilson's theorem, P | ((p-1)! + 1), that is, (p-1)! = - 1 mod P
For any integer n

What is the increasing range of F (x) = Log1 / 2 (x ^ 2-2x-3), I think this is why the decreasing function has an increasing range,

Fixed thinking
When the true part X ^ 2-2x-3 decreases monotonically, f (x) increases monotonically
We only need to find the decreasing interval of x ^ 2-2x-3

Let f (x) = {1 x ^ 2 (x < = 0) 2 LG (x + 1) (x > 0). If f (X.) > 1, then the value range of X. is?

X9

58 = () + () multiply () (), where is prime number
8 = () + () multiplied by () () where is prime number

23+5*7=58

Given that the probability density of continuous random variable x is FX (x), y = - 4x + 1, then FY (y)=