The domain of the function y = - 1 / 2 square of (0.5's X-8) is___ It is y = (0.5 ^ X-8) ^ - 1 / 2

The domain of the function y = - 1 / 2 square of (0.5's X-8) is___ It is y = (0.5 ^ X-8) ^ - 1 / 2

Answer: the domain is x < - 3
Because y = (0.5 ^ X-8) ^ - 1 / 2, so y = 1 / (root 0.5 ^ X-8)
So the number in the root sign should be > 0
So: root 0.5 ^ X-8 > 0
So 0.5 ^ x > 8 can be written as: (2 ^ - 1) ^ x > 2 ^ 3
That is: 2 ^ - x > 2 ^ 3, so - x > 3
That is X

The definition field of the function y = |x | + X / x square + 1 is?

The definition field of y = (X & # 178; + 1) / (| x | + x) is: {x | x > 0}

What is the domain of the function y = 1 / 2 of the square of 4-x + X-1?

The domain of y = [1 + sqrt (x-1)] / (4-x) ^ 2 must be: x > = 1 and X! = 4
Because X-1 is greater than or equal to 0 and 4-x is not equal to 0

Given that the function f (x) = ax + B / 1 + x square is an even function over (- 1,1) and f (1) = 2 / 5, find f (t-1) + F (T) < 0

F (x) should be an odd function. F (x) = (AX + b) / (1 + X & sup2;) is an odd function, f (- x) = - f (x) ∪ (- ax + b) / (1 + X & sup2;) = (- ax-b) / (1 + X & sup2;) ∪ B = 0. F (x) = ax / (1 + X & sup2;) and f (1) = 2 / 5, then a / 2 = 25, a = 50. So f (x) = 50x / (1 + X & sup2;), can be proved by definition

It is known that the two equations of x 2 + 2 (A-1) x + a2-7a-4 = 0 are x 1 and x 2, and satisfy x 1x2-3x1-3x2 + 4 = 0. Find the value of A

According to the meaning of the title, we get X1 + x2 = - 2 (A-1), x1 · x2 = a2-7a-4, ∵ x1x2-3x1-3x2 + 4 = 0, that is, x1x2-3 (x1 + x2) + 4 = 0, ∵ a2-7a-4 + 6 (A-1) + 4 = 0

The original price of a computer is 6000 yuan. The price is reduced by 25% and increased by 10%. What's the current price?

6000 × (1-25) × (1 + 10%) = 4950 yuan

Given that rational numbers a and B satisfy a (a + 1) - (a 2 + 2b) = 1, find the value of a 2-4ab + 4B 2-2a + 4B

Ask an algebra problem in grade one
A * b = ab of a + B, find the value of 2 * 10 * 10

2※10※10=(2+10\2×10)10※10=2.5※10=2.5+10\2.5×10=2.9

Discrimination of Ma Zhe
1. "Without human emotion, there would never have been and could never have been a pursuit of truth."
2. The extension of free time is an important condition for people's free and all-round development

1. Yes. Lenin. Value has a reaction to truth
2. Right. People are moving from the kingdom of necessity to the kingdom of freedom. The space is getting larger and larger, the time of freedom is getting longer and longer, and people will realize more and more free and all-round development

One two digit number, the sum of ten digit number and one digit number is 11. If you transpose ten digit number and one digit number, the two digit number will be 63 larger than the original one

Let the original 2-digit 10 digit number be x and the individual digit number be y
Then x + y = 11
10y+x-（10x+y）=63
The solution is x = 2
y=9