Who is the ratio of pi to whom, and what is the ratio

Who is the ratio of pi to whom, and what is the ratio

The ratio of circumference to diameter is π

All formulas of volume and surface area of geometry in mathematical space
All, must be all cylinder ~ prism, cone, pyramid, platform, edge, billiard, etc

Summary table of surface area and volume formula of space geometry 1. Area and volume formula of polyhedron 2. Area and volume formula of revolving body 1. Cylinder: & nbsp; surface area: 2 π RR + 2 π RH volume: π R & # 178; H (R is the half diameter of upper and lower circles of cylinder, h is the height of cylinder) & nbsp; 2

It is known that f (x) is an odd function on R, and when x is greater than 0, f (x) = - x square + 2x + 2. Find the analytic expression of F (x)

When x is greater than 0, f (x) = - X's square + 2x + 2
When x is small, f (x) = - f (- x) = - x ^ 2 + 2x-2

If a divides B, then a is a multiple of B______ ．

The analysis shows that if a can divide B, then a is a multiple of B and B is a divisor of a, which is wrong

How to deduce the minimum distance from the focus on the ellipse to the ellipse
A b c e instead of a number
Can you be more specific

Let a point on the ellipse be (x, y), which satisfies the elliptic equation (1)
The distance formula from (x, y) to focus (C, 0) d = (2)
(1) The equation with X as the independent variable and distance D as the dependent variable is obtained by (2) after y. then (x, y) satisfying the condition when D is the minimum is obtained

Are 13 ones, 17 ones, 19 ones prime numbers

1111111111111 = 53 * 20964360587
Others

Given the function f (x) = LNX + A / X (a < 0), the line L is tangent to the image of the function y = f (x). (1) find the range of the slope k of the line L
(2) Let g (x) = f (x + 1) - 6x, given that the image of the function y = g '(x) passes through the point (- 1 / 3,0), find the extremum of the function y = g (x)

(1) The definition field of function is x > 0.k = f '(x) = 1 / x-a / X & # 178; = (x-a) / X & # 178; ∵ x > 0 A0, i.e. K ∈ (0, + ∞) (2) f (x + 1) = ln (x + 1) + A / (x + 1) g (x) = ln (x + 1) + A / (x + 1) - 6xg' (x) = 1 / (x + 1) - A / (x + 1) & # 178; - 6 g '(- 1 / 3) = 0, i.e. 1 / (-)

If M and N are on two points of the inverse scale function image, please point out the shortest line segment Mn

Through (0, 0) point do y = x image two functions get intersection Mn is the shortest

If points a and B on the number axis represent - 2 and 1 respectively, and point P is a point with a distance of 5 from point a, what is the sum of the distances from point ABP to the origin?
Math homework in grade one is urgent

If the distance between P and a is 5, then p is - 7 or 3
Therefore, the sum of the distances from ABP to the origin is 2 + 1 + (7 or 3) = 10 or 6

Let the probability density of random variable (x, y) be f (x, y) = {K (6-x-y) 0 〈 x 〈 2,2 〈 y 〈 4,0}
(1) Determination of constant k
(2) Find P {x 〈 1, y 〈 3}
（3）P{X〈1.5}
(4) Find P {x + y less than or equal to 4}

Seeking integral 0 〈 x 〈 2, 2 〈 y 〈 4
8k=1
k=1/8
Find P {x 〈 1, y 〈 3}
Seeking integral 0 〈 x 〈 1, 2 〈 y 〈 3
p=9/16
P{X〈1.5}
Seeking integral 0 〈 x 〈 3 / 2,2 〈 y 〈 4
p=27/32
Finding P {x + y less than or equal to 4} finding integral 0 〈 x 〈 2, 2 〈 y 〈 4-x
p=2/3