The intersection coordinates of the line 3x + 10y-25 = 0 and x ^ 2 / 25 + y ^ 2 / 4 = 1?

The intersection coordinates of the line 3x + 10y-25 = 0 and x ^ 2 / 25 + y ^ 2 / 4 = 1?

Find the common point coordinate, that is, find the intersection point coordinate, in which (x, y) satisfies the above two equations at the same time; [x0d] so two equations can be established simultaneously, and the corresponding X and y can be solved; [x0d3x + 10y-25 = 0; y = (25-3x) / 10 can be obtained; substitute into the following equation: (x0dx2 / 25 + Y2 / 4 = 1; x-6x + 9 = 0; [x0d] can be solved

Solve the equations: 2x + 3Y = 34x − y = 13

② X = 3, we get 12x-3y = 39 (3), from (1 + 3), we get 14x = 42, x = 3. (2 points) substituting x = 3 into (2 points), we get 4 × 3-y = 13, y = - 1. (4 points). The solution of the original equations is x = 3Y = - 1. (6 points)

1 / x + 1 / y + 1 / z = 1, then x + y + Z equals 1

1 / x + 1 / y + 1 / z = 1, then: x = 2, y = 3, z = 6;
Or: x = 2, y = 6, z = 3;
x=3,y=2,z=6；
x=3,y=6,z=2；
x=6,y=2,z=3；
x=6,y=3,z=2
So, x + y + Z = 2 + 3 + 6 = 11
A: x + y + Z equals 11
.

Y + Z of x = Z of Y + x = x + y of Z (x + y + Z is not equal to 0), find x + Y-Z of X + y + Z

Let (y + Z) / x = (Z + x) / y = (x + y) / z = K
y+z=kx
x+z=ky
x+y=kz
2(x+y+z)=k(x+y+z)
2(x+y+z)=k(x+y+z)
(2-k)(x+y+z)=0(x+y+z≠ 0)
k=2
x+y=2z
(x+y-z)/(x+y+z)
=(2z-z)/(2z+z)
=z/3z
=1/3

If the circumference of the bottom surface of a cylinder is 12.56 decimeters and the height is 5 decimeters, then the side area of the cylinder is______ Square decimeter, the area of a bottom is______ Square decimeter, the surface area of the cylinder is () square decimeter, the volume of the cylinder is______ Cubic decimeter

Side area: 12.56 × 5 = 62.8 (square decimeter); 12.56 ﹣ 3.14 ﹣ 2 = 2 (decimeter); bottom area: 3.14 × 22 = 12.56 (square decimeter); surface area: 62.8 + 12.56 × 2, = 62.8 + 25.12, = 87.92 (square decimeter); volume: 12.56 × 5 = 62.8 (cubic decimeter)

There are three natural numbers ABC. If a * b = 10, b * C = 35 and a * C = 14 are known, what is the value of a * b * C?

Divide a * b = 10 by B * C = 35
a/c=2/7
And because a * C = 14
So C = 7, a = 2
A * b = 10
Then B = 5
So a * b * C = 70

If the solution sets of inequality (1 / 2x) < A + 5 and 2x < 4 about X are the same, then the value of a is ()

1/2 x < a + 5 ==> x a=-4

How many eights are counted from one to 100

20

Given that 2 / x = 3 / y = 4 / Z, and X + 2Y + Z = 36, find the value of xy-yz-xz

Let 2 / x = 3 / y = 4 / z = K
Then x = 2K, y = 3k, z = 4K
And X + 2Y + Z = 36
2k+6k+4k=36
k=3
x=6,y=9,z=12
xy-yz-xz=6×9-9×12-6×12=-126

19 * 99 + 99 = how much reward do I give the most? You should have a formula to write clearly. Don't give a direct answer or give no points

19*99+99=99*(19+1)=99*20=1980