If x + y = 3, the square of X - the square of y = 21, find the value of the cubic power of X - the cubic power of 12Y Right now

If x + y = 3, the square of X - the square of y = 21, find the value of the cubic power of X - the cubic power of 12Y Right now

x+y=3,x^2-y^2=21 (x+y)(x-y)=21 x-y=21/3=7 x=3,y=-2 x^3-12y^3 =27-96 =-69

Given the quadratic power of X + quadratic power of Y + 2x-6x + 10 = 0, find the Y power of x =?

It is known that X & # 178; + Y & # 178; + 2x-6y + 10 = 0
Then (x + 1) ² + (Y-3) ² = 0
So x + 1 = 0, Y-3 = 0
So x = - 1, y = 3
So x ^ y = (- 1) &
If you don't understand, I wish you a happy study!

If x + y = 3, x2-y2 = 21, then X3 + 12y3=______ ．

When x = 5, y = - 2, X3 + 12y3 = 53 + 12 × (- 2) 3 = 125-96 = 29

How much is the odd number 1 + 3 + 5 + 7 + 9 + 11 + 13 added to 99?

S = A1N + Nd (n-1) / 2 = 1 * 50 + 50 * 2 * (50-1) / 2 = 2500
A1 represents the first number, n represents the number of numerical values, a total of 100 / 2 = 50, D represents the difference of every two adjacent numbers, i.e. 2

Can a cylinder cut a plane to get a drum shape?
why?

Hello, Zhang Wuji
Absolutely
A drum shaped cross section can be obtained by cutting a chord (any chord except diameter) at the top and bottom of the cylinder to the corresponding chord at the bottom
The farther the chord is from the diameter, the larger the bulge
The closer the chord is to the diameter, the smaller the bulge
The chord is equal to the diameter and the section is a rectangle
The chord length of the top and bottom is not consistent, and the bottom length of the drum is not consistent
Are you right? Good luck. Goodbye

The length of a rectangle is 18.6 cm, which is 1.5 times the width. What is the area of the rectangle?

(18.6 △ 1.5) × 18.6 = 12.4 × 18.6 = 230.64 square centimeter

4x*x-4x+9y*y-12y+5=0
Who would? Help! Please

(2x-1)^2+(3y-2)^2=0
Two nonnegative numbers add to get 0, so both numbers must be 0 at the same time
Then 2x-1 = 0.3y-2 = 0
The solution is x = 1 / 2, y = 2 / 3
^Denotes square

Given the circle C: x ^ 2-8x + y ^ 2-9 = 0, cross the point m (1,3) as a straight line, circle C at two points a and B, the maximum area of triangle ABC
How can I explain that the line passing through point m has the largest area when it is the edge of a circle inscribed with a square

Convert to standard form (x-4) ^ 2 + y ^ 2 = 5 ^ 2 r = 5
Let the distance between a straight line and a circle be D, then s = 1 / 2 * D * √ (R ^ 2-D ^ 2) = 1 / 2 * √ [(R ^ 2-D ^ 2) * d ^ 2]

If P is a prime number greater than 3, it is proved that 24 divides P & sup2; - 1
Theoretical proof

P ^ 2-1 = (P + 1) (p-1) P + 1 and P-1 are two adjacent even numbers, so there must be one divisible by 4, so (P + 1) (p-1) divisible by 8. According to the drawer principle, three continuous natural numbers, there must be one divisible by 3, P-1, P + 1 are three continuous natural numbers, and P is prime, so there must be one divisible by 3

If the function f (x) is a decreasing function on positive infinity and negative infinity, then the monotone increasing interval of function f (2x-x & sup2)

Because f (x) is a decreasing function on positive infinity and negative infinity, the monotonic increasing interval is the decreasing interval of 2x-x ^ 2, so the decreasing interval of 2x-x ^ 2 is [1, + ∞)