Which is the smallest of 9 out of 13, 16 out of 48 and 45 out of 50 I'm tired of it. I hope you can help me

Which is the smallest of 9 out of 13, 16 out of 48 and 45 out of 50 I'm tired of it. I hope you can help me

9 / 13 ≈ 0.69
16 out of 48 ≈ 0.33
45 out of 50 = 0.9
So 16 out of 48 is the smallest

Conic parametric equation
It is known that the ellipse a = 2, B = 1 has a straight line (but the origin) intersecting with the ellipse at two points a and B. the coordinates of two points a and B are expressed by parameter equation, and the meaning of parameter is pointed out
In a hurry in a hurry

In the first case, the line is parallel to the y-axis, a (x1, Y1) B (x1, Y2), where X1 is the intersection of the line and the x-axis. In the second case, the line is not parallel to the y-axis, let y = KX + B, B is not equal to 0, and get formula 1 together with the elliptic equation

If the inequality 2x is less than or equal to a and there are only three positive integer solutions, then the value range of a is

The value range of a is [6,8]

47 seconds = fraction of a fraction

47 out of 55

If the sequence {an} satisfies A1 = 2, an + 1 = (1 + an) / (1-an), N + 1, n is the subscript, and N belongs to n *, then the value of A1 * A2 * A3 *. * A2010?

a1=2,an+1=(1+an)/(1-an) ,
The first several items of the sequence can be calculated in turn
a1=2,a2=-3,a3=-1/2,a4=1/3,a5=2,a6=-2,……
It can be found that the sequence is a sequence with a period of 4
a1*a2*a3*a4=1.
2010=4*502+2.
Then A1 * A2 * A3 *. * A2010 = (A1 * A2 * A3 * A4) ^ 502 * (A1 * A2)
=1*(2*(-3))=-6.

A simple system for computing univariate polynomials with integral coefficients (absolute high score)
If the answer is correct, 80 points will be added!
(1) Consider the following polynomial example to implement the input function, which reads in and constructs the internal representation of the polynomial:
3 x^5 + 2 x^2 + 4
100 x^20000 + 1
10 x^6 - 100 x^20 + 1
You can also design your own more simple polynomial input method. If you use your own design, please specify the form used in the report, and give at least 6 examples that your own system can accept (according to your own polynomial input form)
(2) Design an internal representation for unary polynomials (link table is recommended)
(3) Realize the output function of one variable polynomial, and generate readable output from internal representation
(4) To achieve the required several calculation functions
(5) Considering the variable processing in calculation, a structure is designed and implemented to save the relationship between variable name and value
(6) Implement a simple interactive processing interface. The calculation expression can be in the form of suffix or infix

#Include # include typedef struct {float coef; / / coefficient int Expn; / / exponent} term; typedef struct lnode {term data; / / term polynomial value struct lnode * next;} lnode, * linklist; typedef linklist polynomials

The blood of the human body accounts for about 113% of the body weight, and about 23% of the blood is water. Xiao Ming's weight is 52 kg, and how many kg of water is contained in his blood?

52 × 113 × 23, = 4 × 23, = 83 (kg); a: there is about 83 kg of water in your blood

Why does the function f (x) = 3 ^ √ X have tangent but no derivative at x = 0?

The question you asked is very good. You need to understand the definition of tangent. Tangent is the line connecting two points after infinite approximation. Derivative must have left derivative and right derivative. Obviously, f (x) has no derivative when x = - 0, so derivative does not exist

Who can solve this problem: find the positive integer solution (velocity,) of equation (2x + y) * (x-2y) = 7

Because (2x + y) * (x-2y) = 7 = 1 × 7 = (- 1) × (- 7)
therefore
2x+y=1,
x-2y=7,
or
2x+y=7,
x-2y=1,
or
2x+y=-1
x-2y=-7,
Or 2x + y = - 7,
x-2y=-1,
Solution
x=3,
y=1,

If the two sides of the angle alpha and the two sides of the angle beta are perpendicular to each other and the angle alpha is 72 degrees less than twice of the angle beta, then the angle alpha is equal to?

Both sides perpendicular to each other = = > A = B (1)
A + 72 = 2 * B (2)
Substituting 1 into 2 gives a = 72 degrees