If polynomials about X, Y: x ^ (m-2) y ^ 2 + MX ^ (m-2) + NX ^ 3Y (M-3) - 2x (M-3) y + m + n

If polynomials about X, Y: x ^ (m-2) y ^ 2 + MX ^ (m-2) + NX ^ 3Y (M-3) - 2x (M-3) y + m + n

There is only one polynomial, no question? Ask for nothing to know

If the polynomials of X, y are: x ^ m-2y ^ 2 + MX ^ m-2y + NX ^ 3Y ^ m-3-2x ^ m-3y + m + N, the reduced polynomials are quartic trinomials, and the values of M, n are obtained
If the polynomials of X, y are: x ^ m-2y ^ 2 + MX ^ m-2y + NX ^ 3Y ^ m-3-2x ^ m-3y + m + N, the reduced polynomials are quartic trinomials, and the values of M, n are obtained

The coefficient of x ^ m is 1 + m-2x ^ 3Y ^ m is NY ^ 2, the coefficient of - 2Y is - 2-3, and the constant term is m + n. because the reduced term is quartic trinomial, and the Y ^ 2 and Y terms must exist and cannot be 0, there must be m + n = 0. If x ^ m is quartic, there must be n = 0, and M + n = 0 = = > m = 0

It is known that the sum difference of the polynomial 2x ^ 2 + my-12 and the polynomial NX ^ 2-3y + 6 does not contain x, Y. find the value of M + N + Mn
Given that the sum difference of the polynomial 2x ^ 2 + my-12 and the polynomial NX ^ 2-3y + 6 does not contain x, find the value of M + N + Mn. What is the meaning of sum and difference in this sentence?

(2x^2+my-12)-(nx^2-3y+6)
=(2-n)x²+(m+3)y-18
Because we know that the difference between the polynomial 2x ^ 2 + my-12 and the polynomial NX ^ 2-3y + 6 does not contain x, y
therefore
n=2,m=-3
So m + N + Mn = - 3 + 2-6 = - 7
Because we can get m, n by the difference
Then it doesn't make sense to talk with others

If the value of X * x + 3x-5 is 7, what is the value of 2-9x-3x * x

-34.

If the length and width of a rectangle are increased by 10 cm, the area will be increased by 800 square cm

Let the original length be a and the width be B
(a+10)(b+10)-ab=800
ab+10a+10b+100-ab=800
10a+10b=700
a+b=70
therefore
Perimeter = 2 (a + b) = 70 × 2 = 140 cm

What is the relationship between time, distance and speed?

Distance equals time multiplied by speed, speed equals distance divided by time, time equals distance divided by speed

The differential equation y is multiplied by the first derivative of y = x, and the general solution is obtained

y*y'=x
y'=x/y
dy/dx=x/y
ydy=xdx
The indefinite integral on both sides is obtained as follows:
y^2/2=x^2/2+c1
y^2-x^2=c

If the central angle of a cone's side view is 120 °, the ratio of its side area to its surface area is___ ．

The arc length of ∵ fan is 120 × π R180, the circumference of the bottom circle of cone is 2 π R, ∵ 120 × π R180 = 2 π R, RR = 31, we can get the following formula: cone generatrix L = R, ∵ side area formula of cone: S = π RL, surface area: π RL + π R2 = 4 π R2, ∵ side area: π RL = 3 π R2, ∵ the ratio of side product to surface area is 34

Why is the answer wrong? After checking three times, it's still like this!
Given the set a = (Y | y = x ^ 2-1), B = (x | y = root (3-x ^ 2), then a intersects B = what I calculate is (1 to root 3 left closed right closed)

Don't ask a for the range Y > = - 1, B for the definition field - root 3 =

Inequality / 3x-6 / - / x-4 / > 2x

(1) When x ≥ 4, the original formula is 3x-6-x + 4 > 2x
That is: - 2 > 0 does not hold
(2) When 2 ＜ x ＜ 4, the original formula is 3x-6 + x-4 ＞ 2x
That is, the contradiction between X ＞ 5 and 2 ＜ x ＜ 4 does not hold
(3) When x ≤ 2, the original formula is: - 3x + 6 + x-4 > 2x
That is: 4x < 2 x < 1 / 2
To sum up, the value range of X is {x | x ＜ 1 / 2}