Judge: 8 is the solution of equation 5x = 40, right? Whether to add x = 8 is the solution of equation 5x = 40

Judge: 8 is the solution of equation 5x = 40, right? Whether to add x = 8 is the solution of equation 5x = 40

5x=40
x=8
That's right

How to solve the equation of 5x + 8 (10-x) = 71?

5x＋8（10-x）=71
5x+80-8x=71
3x=9
x=3

According to the first four terms of the sequence, write a general formula of the sequence - 1,8 / 5, - 15 / 7,24 / 9

The first formula is - 3 / 3
Molecules are 3, 3 + 5, 3 + 5 + 7, 3 + 5 + 7 + 9
The denominator is 3, 5, 7, 9
The denominator is 2n + 1
The molecule is (3 + 2n + 1) * n / 2 = n (n + 2)
The general formula is (- 1) ^ n * (2n + 1) / N (n + 2)

What is the space shape of the intersection line when a plane intersects a sphere?

Circle

Zero degree ice plume, zero degree water

Zero degree ice is better than zero degree water cooling
Matter has three states: solid, liquid and gas. When it changes from solid state to liquid state, it needs to absorb heat. When it sublimates from liquid state to gas state, it also needs to absorb heat. Otherwise, it will release heat. When it changes from solid state to liquid state at zero degree centigrade, it needs to be cooled

What is the meaning of each item in Bernoulli equation

Bernoulli equation: P + ρ GZ + (1 / 2) * ρ V ^ 2 = C, where p, ρ and V are the pressure, density and velocity of the fluid respectively; Z is the vertical height; G is the acceleration of gravity. The above expressions respectively represent the pressure energy P, gravitational potential energy ρ Gz and kinetic energy (1 / 2) * ρ V ^ 2 of the unit volume of fluid. In the process of moving along the flow line, the sum of the above equations maintains

Given function f (x) = LG (1 + x) - LG (1-x)
If f (x) is greater than 0, find the value range of X

F (x) > 0 can be changed into LG (1 + x) > LG (1-x),
So 1 + x > 1-x > 0,
X > 0 is obtained from 1 + x > 1-x;
From 1-x > 0 to x < 1,
Take the intersection and get 0 < x < 1

Which hemisphere does latitude 22 degrees north and longitude 175 degrees west belong to? The eastern hemisphere or the western hemisphere?

The region is in the Western Hemisphere, which is 20 W and 160 E
It's Midway Island

The sum of three consecutive even numbers is 144, and the number in the middle is m. can you solve these three even numbers by using equations? Answer in three minutes!

3xM=144
M = 48
So three even numbers are 46, 48, 50

If the nonzero real number n is the root of the equation X2 (xsquare) - MX + n = 0, then N-M =?

According to Weida's theorem, X1 + x2 = - M (1), X1 + 7 + x2 + 7 = m, that is, X1 + x2 + 14 = m (2), substituting (1) into (2)
-The first equation is x square + 7x + 12 = 0, where X1 = - 3, X2 = - 4,
So n = (x1 + 7) (x2 + 7) = (- 3 + 7) (- 4 + 7) = 12, M = 7, n = 12