On the inequality system x + 152 ＞ x − 32x + 23 ＜ x + a of X, there are only four integer solutions, then the value range of a is () A. -5≤a≤-143B. -5≤a＜-143C. -5＜a≤-143D. -5＜a＜-143

On the inequality system x + 152 ＞ x − 32x + 23 ＜ x + a of X, there are only four integer solutions, then the value range of a is () A. -5≤a≤-143B. -5≤a＜-143C. -5＜a≤-143D. -5＜a＜-143

The solution set of inequality system is 2-3a ＜ x ＜ 21, because the inequality system has only four integer solutions, then the four solutions are 20, 19, 18, 17. So we can get 16 ≤ 2-3a ＜ 17, and the solution is - 5 ＜ a ≤ - 143
On the inequality system x + 152 ＞ x − 32x + 23 ＜ x + a of X, there are only four integer solutions, then the value range of a is ()
A. -5≤a≤-143B. -5≤a＜-143C. -5＜a≤-143D. -5＜a＜-143
The solution set of inequality system is 2-3a ＜ x ＜ 21, because the inequality system has only four integer solutions, then the four solutions are 20, 19, 18, 17. So we can get 16 ≤ 2-3a ＜ 17, and the solution is - 5 ＜ a ≤ - 143
If the solution set of inequality 1 / 2 (AX-5) > x-a about X is inequality 1-2x
Inequality 1-2x-1
Solve the inequality 1 / 2 (AX-5) > x-a to get (1 / 2a-1) x > 5 / 2-a
Because of the inequality 1-2x-1, so (1 / 2a-1) must be greater than 0 (otherwise, the direction of unequal good is wrong, that is, the solution set of xx-a is x > (2-A) / (1 / 2a-1)
According to the meaning of the title
(2-a)/(1/2a-1)=-1
A = 3 of the solution
complete
7（2x-1）-3（4x-1）=4（3x+2）-1
7 (2x-1) - 3 (4x-1) = 4 (3x + 2) - 1, without brackets, it is: 14x-7-12x + 3 = 12x + 8-1, the shift term is: - 10x = 11, ｜ x = - 1110
Solve the following equation (3x + 2) minus 4x = 0 (3x-1) (X-2) = (4x + 1) (X-2) by factorization
Let's see, the first question is 4x is less than a square, the second question is divided into the situation x = 2 or X is not 2, when x is not 2, X-2 is deleted on both sides, and X is - 2
Just two questions
The definition field of F (x) = LG (radical 3-tanx) is a, and the set B = {x | X & # 178; - 6x + 5 ≤ 0}
Ask a ∩ B =?
A = (- π / 2 + K π, π / 3 + K π) k is an integer, B = [1,5] a ∩ B = [1, π / 3) ∪ (π / 2,4 π / 3) ∪ (3 π / 2,5]
You can draw a Venn chart
It is necessary to arrange the polynomial 2xy2-x2y-x3y3-7 in ascending order of X______ .
The answer is: - 7 + 2xy2-x2y-x3y3
The position relationship between circle and circle
The equal circle O 1 and O 2 intersect with two points a and B. the circle O passes through the center O 2 of O 2, and the degree of O 1ab is calculated
Connect O1, O2; O1A, 02A, 01B, 02B
It can be concluded that triangle 0102a and triangle 0102b are equilateral triangles
So the angle 01ab is 30 degrees
Sixty
Possibility in the infinite
1,2(4x-5) 2,-3（1-1/6x） 3,-x+（2x-2）-（3x
1,2(4x-5)
2,-3（1-1/6x）
3,-x+（2x-2）-（3x+5）
4.3a+a-（2a-2a）+(3a-a)
1：8x-10
4x^4y-5x^2y-9y^2
=y(4x^4-5x^2-9y)
(4x^2-9y)(x^2+y)