3x

3x

（1) 3x=-2
X
Find 3N = 1 + 2x ^ 2 + 3x ^ 4 + 4x ^ 6 + +The solution of 10x ^ 18
It's not equal difference, it's not equal ratio
Multiply the equation by x ^ 2 to get:
3n*x^2=x^2+2x^4+3x^6+… +9x^18+10x^20
By subtracting the two equations:
3n-3n*x^2=1+x^2+x^4+x^6+… +x^18-10x^20
3n-3n*x^2=1*（1-x^20)/(1-x^2)-10x^20
I'm only inferior, sorry!
Solution equation: 4y-24 = 16 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2.5x △ 6 = 2.5 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 3x + 2.4x = 10.8
（1）4y-24=16             4y=24+16           4y=40      ...
What is the relationship between the value of ABC in quadratic function and image?
Same title
a> 0 function image opening up
The intercept of A0 function and Y axis is above X axis
There are two intersections between C0 function image and X axis
There is an intersection point between b2-4ac = 0 function image and X axis
b2-4ac
Let the quadratic function be: F (x) = AXX + BX + C (XX is the square of x), where the opening of x0 parabola is upward, and the function can take the minimum value. When B = 0, the vertex of parabola is at the origin of coordinate. Let x = 0, then f (x) = C, that is, C0, C > 0
When the image is in quadrant 3,4, A0, C > = 0
When the image is in quadrant 1,2,4, a > 0, B = 0
When the image is in quadrant 1,3,4, A0, C
Given that the solution set of inequality MX & # 178; - 2x-3 ≤ 0 is - 1, n seek the value of M + 2n
Take - 1 to get m + 2-3 = 0, so m = 1 is brought into the original inequality X & # 178; - 2x-3 ≤ 0
The solution is - 1 ≤ x ≤ 3, so n = 3
So m + 2n = 1 + 2 * 3 = 7
Given that the square of x = 9, a and B are opposite to each other, and X and y are negative reciprocal to each other, then one part of x minus one part of XY ab
If you add one of the Y's, the value is () A. plus or minus 3, B. 3 / 8, C. - (3 / 8), D. plus or minus 8 / 3
X = 3, y = - 1 / 3 or x = - 3, y = 1 / 3A + B = 0. I think your question is wrong. It should be 1 / X - (a + b) / XY + 1 / y = 1 / x + 1 / y = (x + y) / xy = (x + y) x + y = 3-1 / 3 = 8 / 3 or x + y = - 3 + 1 / 3 = - 8 / 3  1 / X - (a + b) / XY + 1 / y = ± 8 / 3
Chinese character formula and alphabet formula of multiplication distribution law
The Chinese character formula of the law of distribution by multiplication is: the multiplication of a number by the sum of two numbers will be equal to the multiplication of the sum of the products of the two addends, and the number will not change. The letter formula is: a (B + C) = AB + AC
Hello, break the boundaries of the team for you
The Chinese character formula of the law of multiplicative distribution is: if a number is multiplied by the sum of two numbers, it will be equal to the sum of the product of the two addends multiplied by the number, and the result will not change.
The letter formula is: ax (B + C) = AB + AC
I hope my answer can help you, no, please ask, hope to adopt o (∩)_ ∩)O~
The law of distribution by multiplication is a theorem: the multiplication of a number by the sum of several numbers is equal to the multiplication of the number by the sum of the products of those numbers.
The expression of this theorem is multiplication formula: a (B + C + D...) = AB + AC + AD +
Multiplicative allocation rate
The letters are: (a + b) × C = a × C + B × C
Chinese character formula: the sum of two numbers multiplied by a number, you can first multiply them with the number, and then add them to get the same number, this is called the law of distribution of multiplication.
Solve the following inequality
solution
①1010-12
x>-2
②4-3x≤4x-3
-4x-3x≤-3-4
-7x≤-7
x≥1
∴x≥1
①10
On the skills of solving quadratic function image
(1) the coordinate of the intersection of the image of quadratic function and X-axis needs to be transformed into a quadratic equation of one variable;
(2) to find the maximum (minimum) value of quadratic function, we need to use the collocation method to transform the quadratic function from the general form to the vertex form;
(3) judging the sign of a, B, C in the quadratic function ax & # 178; + BX + C = 0 according to the position of the image, or judging the position of the image by the sign of a, B, C in the quadratic function, it is necessary to combine the number and shape;
(4) the image of quadratic function is symmetric with respect to the axis of symmetry. By using this property, we can sum up the point coordinates of a known point, or an intersection coordinate with the X axis, and get another intersection coordinate from the symmetry
(5) the quadratic trinomial is also related to the quadratic function. The quadratic trinomial ax & # 178; + BX + C (a ≠ 0) itself is the quadratic function containing the letter X. take a > 0 as an example to reveal the internal relationship between quadratic function, quadratic trinomial and quadratic equation of one variable
The image information problem of quadratic function is one of the key points of college entrance examination. How to quickly and accurately solve the information problem of quadratic function?
Related theorem:
1. Definition and definition expression
There is a general relationship between Y and X
(a, B, C are constants, a ≠ 0, and a determines the opening direction of the function. When a > 0, the opening direction is upward, a ≠ 0
What is the minimum value of (T + T) = 3t-u?
[4 (- 2) (- t) - (3T) ^ 2] / 4 (- 2) = 9t ^ 2 / 8-t why is this the maximum?
F (x) = - 2x ^ 2 + 3tx-t, max
[4(-2)(-t)-(3t)^2]/4(-2)=9t^2/8-t
When it takes the minimum value
t=-1/[-2(9/8)]=-4/9
Function ax ^ 2 + BX + C
Max / min (4ac-b ^ 2) / 4A
-4/9