How many pronunciations does the word "Yan" have

How many pronunciations does the word "Yan" have

Pharynx [y ā n]
The posterior part of the oral cavity is composed of muscle and mucous membrane, which is divided into three parts. The upper part is symmetrical with the nasal cavity "nasopharynx"; the middle part is symmetrical with the oral cavity "oropharynx"; the lower part is called "laryngopharynx" at the posterior part of the larynx. Pharynx is the common passage of respiratory tract and digestive tract (also known as "pharynx"): larynx
Pharynx [y à n]
Make food or other things in the mouth pass through the throat into the esophagus: spit. Wolf eats tiger. Chew slowly
Pharynx [y è]
The sound is muffled by obstruction
Through the throat to the esophagus: saliva. Wolf swallow tiger

There are several pronunciation groups

Fen [f ē n]
To divide; divide
Fen [f è n]
Too much
Reputation; affection;

It is known that LG2 is about 0.3010 10 ^ 0.175, about 1.04, and log ((1 + x), 5) = 40

log(1+x)(5)=40
lg5/lg(1+x)=40
lg(1+x)=lg5/40=lg(10/2)/40=(1-lg2)/40=(1-0.3010)/40=0.0175=0.1×0.175
10lg(1+x)=0.175
(1+x)^10=10^0.175=1.04
1+x=1.0039
x=0.0039

Calculate 1 + 2-3-4 + 5 + 6-7-8 + 9 + 10-11-12 +1993 + 1994-1995-1996 + 1997 + 1998-1999-2000, the final result is ()
A. 0B. -1C. 1999D. -2000

The original formula = (1 + 2-3-4) + (5 + 6-7-8) + (9 + 10-11-12) + +（1997+1998-1999-2000）=（-4）+（-4）+（-4）+… +(- 4) = - 4) × 50 = - 2000, so D

The right focus F of the ellipse x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 (a > b > 0), the intersection of the right guide line and the X axis is a, and there is a vertical bisector on the ellipse that P satisfies AP
For the right focus F of the ellipse x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 (a > b > 0), the intersection point of the right guide line and the X axis is a, and there is a vertical bisector passing through point F with point P satisfying AP on the ellipse, what is the value range of the eccentricity of the ellipse?

From the known | PF | = | AF | = a ^ / C - C = B ^ 2 / C, let P (x0, Y0) then - a ≤ x0 ≤ a
Then | pH | = a ^ 2 / C - x0
According to the definition of ellipse eccentricity, e = | PF | / | pH | = (b ^ 2 / C) / (a ^ 2 / C - x0)
A (AC-B ^ 2) / C ^ 2 = x0
The solution is e ∈ [1 / 2, 1)

A is a prime, and a + 6, a + 8, a + 12, a + 14 are all prime, then what is the minimum of a?

In fact, starting from the smallest prime number, one by one is the best and fastest way to solve the problem

Given that loga (b) = logb (a) (a, b > 0), we prove that a = B or a = 1 / b

loga(b)=logb(a)
lnb/lna=lna/lnb
(lna)²=(lnb)²
(lna)²-(lnb)²=0
(lna+lnb)(lna-lnb)=0
LNA = LNB or LNA = - LNB
So a = B or a = 1 / b

Draw the image of the following functions with the tabular plot method
Like y = X-2, y = 3-2x (0 ≤ x ≤ 4), I know which quadrant a straight line passes, but how to determine the point?

You can bring in the calculation as follows:
When x = 1, y = X-2, y = - 1, so passing the point (- 1,1)
When x = 2, y = 0, so it passes through (2,0)
…… To push

If the distance between two points a and B representing X and 1 on the number axis is equal to 2, find the value of X!

From the meaning of the title, we can see that | X-1 | = 2
The solution is x = 3 or x = - 1

Integral range of marginal probability density
x. The probability density of Y is f (x, y) = 4, - 0.5 ≤ x ≤ 0,0 ≤ y ≤ 2x + 1; for others, f (x, y) = 0, find the marginal probability density of Y, and explain in detail how to get the integral range of Y

The influence of the integral range of the edge density function (0, (Y-1) / 2) of Y on the integral of X
The influence of the integral range of the marginal density function (0,2x + 1) of X on the integral of Y
First of all, the integral area should be drawn. If the edge density of X is required, first fix x, that is, draw a vertical line, and then look at the range of Y