If a is less than 0, then its solution set is?

Because a

Solutions to the inequality of X: X of a + X of b > - 2 (AB > 0)
To explain,

X/a+X/b>-2
bX/ab+aX/ab>-2
(bX+aX)/ab>-2
Because AB > 0
So a and B have the same sign and are not zero
(a+b)X>-2ab
When a and B are both positive numbers, that is, when a + b > 0, x > - 2Ab / (a + b)
When a and B are both negative, that is a + B

When a is half a x

a/2

In the interval [12,2], if the function f (x) = x2 + BX + C (B, C ∈ R) and G (x) = x2 + X + 1x have the same minimum value at the same point, then the maximum value of F (x) in the interval [12,2] is ()
A. 134B. 4C. 8D. 54

G (x) = x2 + X + 1 x = x + 1 x + 1 ≥ 3, if and only if x = 1, the equal sign holds, and the vertex coordinates of the function f (x) = x2 + BX + C are (1,3), x = − B2 = 11 + B + C = 3, then B = - 2, C = 4, f (x) = x2-2x + 4, f (x) max = f (2) = 4

SiNx and (SiNx) ^ 2 and (SiNx) ^ 3 Definite integral from 0 to π / 2
I'm talking about the definite integral of each

- 1 when n = 1
If n > = 2
When n = 2K + 1, it is (2k)! / (2k + 1)!
When n = 2K, it is (2k-1)! / (2k)! * Pai / 2

If a number is multiplied by 1 / 3 and 2 / 9 respectively, the sum of the two products is 5 / 6. This number is ()?

x/3+2x/9=5/6
X = 3 / 2; i.e. 1.5

Master, please come in! Mathematical problems of hypothesis method
There are 38 bicycles, tricycles and cars parked at the entrance of a shopping mall. There are 89 wheels in the car. It is known that there is one less car than two times of the tricycle. Q: how many bicycles are parked at the entrance of the shopping mall?
I mainly know that the car is 2 times less than the tricycle. It's not a one-time equation. It's too difficult. We haven't reached that stage yet. We can see on the Internet that we all use equations from this step. Can we not use equations? Even if we use equations, we don't need those very difficult equations at the level of primary school students. Please solve them by experts! I thank him all my life!

Bicycles 2 wheels tricycles 3 cars 4 if all tricycles 38 × 3 = 114 wheels 14-89 = 25 bicycles more than cars 25 bicycles = cars + 25 cars less than tricycles 2 times 1 tricycle = (cars + 1) / 2 bicycles + tricycles + sedans = small

12345 can get 999

Only using addition, subtraction, multiplication and division can't work out 999, we need to use the power
The power means that B a are multiplied by a ^ B, and the result is a * a * a *... * a (b)
Using addition, subtraction, multiplication, division, square and bracket, there are 14 formulas
2*4*5^3-1=999
(2*5)^3-1^4=999
2*5^3*4-1=999
((4-2)*5)^3-1=999
4*2*5^3-1=999
(4/2*5)^3-1=999
(4*5/2)^3-1=999
4*5^3*2-1=999
(5*2)^3-1^4=999
(5/2*4)^3-1=999
5^3*2*4-1=999
5^3*4*2-1=999
(5*(4-2))^3-1=999
(5*4/2)^3-1=999

The power a of X is greater than 1, which is the range of the value of this inequality for the system of linear equations with one variable of X

For a linear equation of one variable, then
Times a = 1
therefore
x¹>1
That is, x > 1

For a pile of coal, 30% will be used in the first time, 30% in the first time, 25% in the second time, and 0.25 tons more will be used in the first time than in the second time. How many tons of coal is there in total? (equation solution)
Xiao Guang read a story book. He read 30% of the whole book in the morning. If he read another 60 pages in the afternoon, he could finish half of the whole book. How many pages does the story book have in total? (equation solution)

1. There are x tons of coal in total
0.3X-0.25X=0.25 X=5
2. Set a total of X pages
0.3X+60=0.5X X=300

If a is less than 0, then its solution set is?