What kind of pronunciation and word formation should be used

Ying, Pinyin: y ī ng, y ì ng
1. When, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should, should
2. Y ì ng... Machine. Scene. Time. Use. Pay. Change. Pay

”Can't help but "de" how to read the word "Jin"? Read the first tone or the fourth tone?

Can't help Pinyin: Q í ng B ù Z ì J ì n
Forbid: restrain. Can't control one's own feelings

What does the word "can't help but ban" mean

Control. Self prohibition is an inverted usage, which means to control oneself instead of self-control

Please help solve a geometry problem
Let pf = x, PE = y, PD = Z, and 4 / x + 3 / y + 5 / z = 12, then p is the center of gravity of ABC

The heart
In RT △ the radius of the inscribed circle is s / P (P = (a + B + C) / 2)
Then the radius of the inscribed circle is r = 1
x=y=z=1
4/x+3/y+5/z = 4+3+5 =12

The common factor of a square - 2Ab + b square and a square - b square is ()

a2-2ab+b2=(a-b)2
a2-b2=(a+b)(a-b)
Common factor: a-b
2 is the square

Find the derivative of function y = x ^ 2 + ax + B at x (a, B are constants)
(2) Derivative of function y = 1 / X at x = 1
(3) Find the change rate of function y = - 2x ^ 2 + 5 in the interval [2,2 + △ x]

One derivative is 2x + a
2 -1
3 △ Y / △ x when △ x goes to the limit of 0, you can calculate

A company has purchased 10 tickets for an Expo, including 4 class a tickets and 6 class B tickets. Now three of the 10 tickets will be awarded to an employee. (1) calculate the probability that the employee will get 2 class a tickets and 1 class B ticket; (2) calculate the probability that the employee will get at least 1 class a ticket,

(1) According to the meaning of the question, this question is the probability of an equal possibility event. The event included in the experiment is to reward an employee from any 3 of the 10 tickets, with a total of C103 results. The event meeting the conditions is that the employee gets 2 class a tickets and 1 class B ticket, with a total of c42c61 results. According to the probability formula of the equal possibility event, P = c24c16c310 = 310 (2) the employee gets at least class a tickets The opposite event of one ticket is that the employee gets three class B tickets. First, make the probability that the employee gets three class B tickets, which is the probability of an equal possible event. The event included in the experiment is to reward an employee from any three of the ten tickets, with a total of C103 results. The event that meets the conditions is that the employee gets three class B tickets, with a total of C63 results, and the probability that the employee gets three class B tickets The probability of the employee getting at least one class a ticket is 1-c36c310 = 56

If the quadratic function y = x2-2x + 3 is changed into the form of y = (X-H) 2 + K, then H + K=______ ．

∵ y = x2-2x + 3 = x2-2x + 1 + 2 = (x-1) 2 + 2, ∵ H = 1, k = 2, ∵ H + k = 1 + 2 = 3

Y = 2sinx derivative

（2sinx）‘=2cosx

The addition and subtraction of the first two fractions
The water inlet pipe can fill a pool of water in a hour, and the water outlet pipe can fill a pool of water in B hour (b > A). Now two pipes can fill and drain water at the same time, how long does it take to fill a pool of water?

If the volume of the tank is V, the flow rate of the inlet pipe is v / A and that of the discharge pipe is v / b,
Set the time to fill a pool of water as X hours
(V/a)x-(V/b)x=V
x=(b-a)/(ab)

What kind of pronunciation and word formation should be used