Solution equation: 2x + 93x − 9 = 4x − 7x − 3 + 2

Solution equation: 2x + 93x − 9 = 4x − 7x − 3 + 2

Two sides of the equation multiply by 3 (x-3) to get 2x + 9 = 3 (4x-7) + 6 (x-3) solution and x = 3. It is tested that x = 3 is the root of the original equation, but the original equation has no solution
If 3x + 5 = 8, then 3x = 8-5; if - 4x = 1 / 4, then x = - 1; if 2x = 10-3x, then 2x + () = 10, then 2x + () = 10
If 3x + 5 = 8, then 3x = 8-5 is based on subtracting 5 from both sides
If - 4x = one fourth, then x = - 1 / 16 is based on dividing both sides by - 4
If 2x = 10-3x, then 2x + (3x) = 10, the basis is: add 3x on both sides at the same time
For any real number x, compare the values of two algebraic expressions 3x3-2x2-4x + 1 and 3x3 + 4x + 10
(3x3-2x2-4x + 1) - (3x3 + 4x + 10) = - 2x2-8x-9 = - 2 (x2 + 4x) - 9 = - 2 [(x + 2) 2-4] - 9 = - 2 (x + 2) 2-1 ＜ 0, that is, (3x3-2x2-4x + 1) - (3x3 + 4x + 10) ＜ 0, (3x3-2x2-4x + 1 ＜ 3x3 + 4x + 10)
For any two sets m, N, define: M-N = {x | x belongs to m and X does not belong to n}. M △ n = (m-n) ∪ (n-m), M = {y | y = x ^ 2, X belongs to R}, n = {Y / - 3 is less than y is less than 3}, then m △ n
M = {y} (">" temporarily means greater than or equal to)
N={-3《y3}
N-M={-3《y
(3a + b) (3a-b) (- 1 / 2a-b) (3Y + 2x) ^ 2 (3AB + 2b) ^ 2 - 8A ^ 4B ^ / 6ab ^ 2 (3x ^ 2y-xy ^ 2 + 1 / 2XY) / (- 1 / 2XY)
(3a + b) (3a-b) null (- 1 / 2a-b) (1 / 2a-b) null (3Y + 2x) ^ 2 null (3AB + 2b) ^ 2 null - 8A ^ 4B ^ / 6ab ^ 2 null (3x ^ 2y-xy ^ 2 + 1 / 2XY) / (- 1 / 2XY) is wrong, urgent and correct
9a^2-b^2
b^2-a^2/4
9y^2+6xy+4x^2
9a^2b^2+12ab^2+4b^2
-4a^3/3b
-6x+2y-1
Mathematical volume formula
The volume formula of cone, cylinder and cuboid? The volume of cone is one third of that of cylinder with the same base area and height of cone? I forgot about it,
Cone: v = 1 / 3 π R & sup2; H (R is the radius of the bottom circle, h is the height)
Cylinder: v = π R & sup2; H
Cuboid: v = ABC (ABC is length, width and height respectively)
The volume of a cone is one third of that of a cylinder
3x-7+4x=6x-2．
The result is 3x + 4x-6x = - 2 + 7, and x = 5
If the distance between the image of the first-order function y = kx-3 and the intersection of x-axis and y-axis is 5, the expression of this function is obtained
When x = 0, y = - 3; when y = 0, x = 3 / K, k = 3 / 4, so the expression is y = 3 / 4x-3
For any two sets m and N, define M-N = {x | x ∈ m and X does not belong to n}, m * n = (m-n) ∪ (n-m), let m = {y | y = X2, X ∈ r}, n = {y | y = 3sinx, X ∈ R}, then m * n = ()
A. （-∞，-3）∪（0，3]B. [-3，0）∪（3，+∞）C. （-3，0）∪（3，+∞）D. [-3，0）∪[3，+∞）
According to the meaning of the question, M = [0, + ∞), n = [- 3, 3], so M-N = (3, + ∞), N-M = [- 3, 0), so m * n = (m-n) ∪ (n-m) = [- 3, 0) ∪ (3, + ∞)
If a = x ^ 3-2xy ^ 2 + 1, B = x ^ 3 + XY ^ 2-3x ^ y, then the polynomial 2x ^ 3-7xy ^ 2 + 3x ^ y + 3 = () A.A + B b.a-b c.3a-b d.a-3b
Because the polynomial has a constant of 3, and only a has a constant of 1 in a and B, the polynomial must have the term 3a. Therefore, according to the given options, only C satisfies the condition. So choose C
C