It is known that the solution set of inequality 3x + A / 13 > x-3 / 2 about X is X

It is known that the solution set of inequality 3x + A / 13 > x-3 / 2 about X is X

From (3x + a) / 13 to (x-3) / 2
2（3x+a）＞13（x-3）
6x+2a＞13x-39
7x＜2a+39
From X ＜ (2a + 39) / 7 (1)
And X ＜ 7 (2)
∴（2a+39)/7≤7
2a+39≤49
a≤5.
Solve the following inequalities and express their solution sets on the number axis: 1.3x-2x2x 3.x/2 > x / 3 4.2x-7 > 5-2x 5.1-3x / 2 > 1-2x
6.x-1/2(4x-1)x/4
1.3x-2x0
X>0
4.2x-7>5-2x
4x>12
X>3
5.1-3x/2>1-2x
1/2x>0
X>0
6.x-1/2(4x-1)x/4
3/4x>-1/2
x>-2/3
The solution set of absolute value inequality | 3x-1 | > 1 / 3 is
|3x-1| >1/3
3x-1>1/3
3x>4/3
x>4/9
Or 3x-1
x> 4 / 9 or X1 / 3 or 3x-14 / 3 or 3x4 / 9 or X4 / 9 or X
Solving absolute value inequality | 3x + 4 | > 0
| 3x＋4 | ＞0
3x＋4≠0
3x≠-4
x≠-4/3
Solving absolute value inequality | 3x-4|=
-19≤3x-4≤19
-15≤3x≤23
-5≤x≤23/3
|3x-4|=
When x takes what, the root sign 3x + 1 + 2 takes the minimum value, and finds the minimum value
When x takes what, the value of √ (3x + 1) + 2 is the minimum, and the minimum value can be obtained. The topic has no restrictions on X. the first thing to understand is that the root sign is to understand that "the arithmetic square root is non negative", that is to say, √ (3x + 1) is non negative, and the minimum value is zero. At this time, x = - 1 / 3. For the value of X less than - 1 / 3
Where does the root stop? If it stops after 1, the minimum value is 2. Under the front root, it is a number greater than or equal to 0, when the minimum is 0, and the minimum, x = - 1 / 3
The factorization of 2A (the square of 4x minus 12x) minus 36a (the square of 12x minus 4x) plus 162a
The original formula is ＜ 20 (square of 16x-12x) ＞ 36a (square of 12x-16x) + 162a4a (square of 12x-16x) - 36a (square of 12x-16x) + 162a ＜ 4a (square of 12-16x) - 36a ＞ (square of 12x-16x) + 162a4a ＜ a (square of 12-16x) - 9 ＞ (plane of 12x-16x)
2a(4x2-12x-9)2
Use "because So... " Write the derivation process of the circle area formula
Primary school methods:
Because, a circle is cut into several equal parts along the radius, and then a series of central angles are occluded with each other to form an approximate rectangle; moreover, the more the number of equal parts, the more similar the rectangle is; it can be imagined that if it can be infinitely divided, it will form a long square, the length is half of the circumference of the circle, and the width is the radius of the circle, so s length = a * b = π R * r = π R & sup2;
So s circle = π R & sup2;
The complete square formula of mathematics in grade two (AB =?)
It is known that the equation 5x-2a-1 = x and 7x = 3 (a-53x) - 3 have the same solution, then the value of (A-1) 2 is______ .
From the question meaning: 5x-2a-1 = x solution: x = 2A + 14; from 7x = 3 (a-53x) - 3 solution: x = a − 14; because the solutions of the two equations are the same, so: 2A + 14 = a − 14 solution: a = - 2. Then (A-1) 2 = (- 2-1) 2 = 9; so the answer is: 9