2 / 1-x & lt; 3 / x + 9-5 3 / 2x + 1 + 6 / x + 1 > 6 / 2-x 0.5 / X-1 + 0.75 / 2x-1 ≥ 18 Solving the non negative integer solution of the inequality X / 4-1 < 2-x / 2 by 4x-4 (1-x) < 32 (1 / 6x-2) Given the inequality (2a-b) X4 / 9 about X, find the solution set of inequality (a-4b) x > 3b-2a

2 / 1-x & lt; 3 / x + 9-5 3 / 2x + 1 + 6 / x + 1 > 6 / 2-x 0.5 / X-1 + 0.75 / 2x-1 ≥ 18 Solving the non negative integer solution of the inequality X / 4-1 < 2-x / 2 by 4x-4 (1-x) < 32 (1 / 6x-2) Given the inequality (2a-b) X4 / 9 about X, find the solution set of inequality (a-4b) x > 3b-2a

Just ask

(1) 2 ^ 6 = a ^ 2 = 4 ^ B (a > 0), find the value of a + B. (2) if 3 ^ x = 2, find the value of (9 ^ 2x-y) + 27 ^ X-Y

a=2^3=8,
2 ^ 6 = 4 ^ 3, so B = 3
a+b=11
The second question is to make it clear

If 3 ^ 1-xx27 ^ 2X-4 / 9 ^ - x = 81 ^ 6, find the value of X

3^1-xX27^2x-4/9^-x=3^(1-x+6x-12+2x)=3^(7x-11)=3^24
7x-11=24
x=5

If a ＞ 0 and a ≠ 1, the inequality loga (x ^ 2 + X-2) - loga3 ＞ loga (x + 1 / 3) about X is solved

The original inequality is equivalent to: loga [(x + X-2) / 3] > loga (x + 1 / 3); (a > 0 and a ≠ 1) ①. When 0 ＜ a ＜ 1, (x + X-2) / 3 ＜ x + 1 / 3, that is, x-2x-3 ＜ 0 ≠ - 1 ＜ x ＜ 3 ②. When a ＞ 1, (x + X-2) / 3 ＞ x + 1 / 3, that is, x-2x-3 ＞ 0 ≠ x ＜ - 1 or X ＞ 3

The intersection point of the image of inverse scale function and positive scale function is symmetric about the origin center
Please prove it. Thank you

Let the intersection be
(x1, Y1) and (X2, Y2)
It turns out that X1 + x2 = 0
Let y = KX
Inverse example y = m / X
The combination of the two forms can be obtained
KX∧2-M=0
It can be obtained from Veda's theorem
X1+X2=0
therefore
.

It is known that point a and point B on the number axis represent two opposite numbers a and B (a) respectively

10÷2=5
a=-5
b=5

Probability density
Let x ~ n (0,1) be a random variable, then the probability density of the - x power of y = e is? ()
The answer is (1 / y radical 2 π) * e (- in squared Y / 2) power. What's the matter with the previous y?

The density function of continuous random variable transformation has the following properties
Let the density function of X be f (x), then the density function of y = g (x) is f (x)
F (y) = derivative of F (g inverse (y)) * g inverse (y),
The condition of the above formula is that the inverse function g (y) of the transformation g exists
What you call 1 / y is the derivative of inverse g (y) = - ln (x)

What does cosh (a) stand for?

Hyperbolic cosine
cosh(a)=[e^a+e^(-a)]/2

Please fill in 1, 9, 9, 8, 7, 5.) * (?) *? = 1998,) * (?) *? = 75 in the following formula

1998=2*3*3*3*37
37=5*9-8
2*3*3*3=54=6*9=（7-1）*9
So (5 * 9-8) * (7-1) * 9 = 1998
75=15*1*5
15=9+7-1
1=9-8
So (9 + 7-1) * (9-8) * 5 = 75

Is the area of two parallelograms equal in the following figure? What are their respective areas? I found: parallelogram with equal base and height______ ．

1.8 × 1.5 = 2.7 (square centimeter), answer: the area of the two parallelogram in the figure is 2.7 square centimeter. I found that the area of the parallelogram with equal base and height is equal. So the answer is: the area is equal