The slope of the two-point formula, (Y-Y1) / (y2-y1) = (x-x1) / (x2-x1) what is the slope k in this formula

The slope of the two-point formula, (Y-Y1) / (y2-y1) = (x-x1) / (x2-x1) what is the slope k in this formula

(y2-y1)/(x2-x1)

Isn't the formula for finding the answer and the slope Y2 minus Y1 divided by x2 minus X1? Why is the formula Y1 minus Y2 divided by X1 minus x2 used in the operation?

It's equal! (y2-y1) / (x2-x1) = (y1-y2) / (x1-x2) ---- if the top and bottom are negative, it's eliminated~

Given that x, Z and y satisfy the equation x ^ 2 + (Y-2) ^ 2 + (Z-2) ^ 2 = 2, the maximum value of x ^ 2 + y ^ 2 + Z ^ 2 under the root sign is

3 root 2

In general, the positive side (that is, the side close to the upper epidermis) of the leaves of plants is characterized by the opposite side
A chloroplast more, less stomata, strong color B yelutiduo, stomata more, strong color C chloroplast less, stomata more, light color D chloroplast less, seven hole less, light color

A

5xy2 - [3xy2 - (4xy2-2x2y)] + 2x2y] + 2x2y-xy2, and then evaluate

5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2
=5xy2-3xy2+4xy2-2x2y-2x2y+2x2y-xy2
=5xy²-2x²y

In a plan with a scale of 1:1000, the side length of a square vegetable field is 10 cm. How many hectares is the actual area of this vegetable field

Actual area = 10 × 10 × 1000 × 1000 = 100000000 square centimeters = 1 hectare

On fairy tale composition

Known: three consecutive odd numbers, their sum of squares is 251, find these three odd numbers

Let these three odd numbers be n-2, N, N + 2 in turn, where n is a natural number, then n > 2, then according to the problem meaning, we can get the following equation: (n-2) 2 + N2 + (n + 2) 2 = 251, 3N2 = 243, N2 = 81, n = 9 or n = - 9, when n = 9, n-2 = 7, N + 2 = 11; when n = - 9, n-2 = - 11, N + 2 = - 7; answer: these three consecutive odd numbers are 7, 9, 11 or - 7, - 9, - 11

How to weld one centimeter thick iron plate with fire welding?

Although it can be welded, it has no strength, so it is not often seen. It is recommended to use electric welding. If it is necessary to weld, it can be welded with water after beveling like electric welding

List one or two phenomena in daily life that contain scientific principles

Hello
We usually see the position of the fish in the water is deeper than the actual position, because of the refraction of the water
2. We can see that raindrops always fall in a spherical shape, which is due to the tension of water surface molecules rather than square